Underwater City/Guide
From Melvor Idle
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This content is part of the Atlas of Discovery Expansion.
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This article is a strategy guide for Underwater City.
This guide is meant for single clears and to enable idling with as low as possible requirements. Not to be the most effective method. Information on equipment, mechanics and strategies are on this page.
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If you wish to tweak the Combat Simulator Exports yourself, they can be found here.
Standard Guide
Introduction
This is a 
Barrier dungeon introduced with the 
Atlas of Discovery Expansion, there is a general guide to this dungeon and a more in-depth look into Barrier combat in general in this guide. This page will go deeper into combat options, including when 
Throne of the Herald Expansion is owned and already completed.
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Throne of the Herald to clear the dungeon effectively.
Requirements
- Complete
Cult Grounds - Discover
Melantis 
Damage Reduction Potion IV
Recommended
- Error creating thumbnail: File missingLevel 99,Error creating thumbnail: File missingLevel 95,Error creating thumbnail: File missingLevel 75,Error creating thumbnail: File missingLevel 99.
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Nagaia hit very hard in this dungeon. A lot of damage reduction is required in order to idle this dungeon without dying. Alternatively, the player can return after having progressed through the Throne of the Herald expansion. Having more hitpoints or other damage reducing and damage inflicting bonusses can greatly speed up the clear times of this dungeon. Set 1 clears the dungeon roughly 27 times per hour. Set 2 clears it roughly 8.5 times per hour. (You can swap the weapon & summons in Set 2).
The Preferred Shield is 
Earth Layered Shield, however 
Devouring Barrier Shield can be used, once the upgrade item has been obtained from this dungeon.
Barrier God Shard every time it is cleared. These can be used to upgrade (B) god armours into their respective (C) armours. These can then be used to very effectively clear Error creating thumbnail: File missing
Crystal Depths for 
Pure Crystal Binding Dust if the player hasn't already done this.
Equipment
Below are 2 sets, unlike the previous dungeons, you can't mix and match this dungeon. Set 1 is for post-TotH clears. Set 2 is for clears just before or afterError creating thumbnail: File missing
Impending Darkness Event.
- Set 1 requires Error creating thumbnail: File missingLevel 120.
- Set 2 requires a minimum of Error creating thumbnail: File missingLevel 99. Calculated at all combat skills level 99 in the Combat Simulator.
Set 2 can be all non-B upgraded Terran God Armour with 
Tidal Edge and it will only lower the Kills Per Hour by about 1.5 (from 4.2 to 2.8).
Ultima Godsword/
Fury of the Elemental Zodiacs can be used to increase the Kills per Hour to roughly 6.6.
- Prayers: Error creating thumbnail: File missingBattleheart andError creating thumbnail: File missingBattleborn. Swap toError creating thumbnail: File missingBattleheart andError creating thumbnail: File missingChivalry for Set 2.
- Potion: Damage Reduction Potion IV
- Point of Interest:
Dark Waters
Agility
The Agility obstacles 9 or higher are not required, 8 and below are highly suggested (and simulations were done with those active).
| Slot | Obstacle | Bonuses |
|---|---|---|
| 1 | Error creating thumbnail: File missing Cargo Net | +3% Global GP (except Item Sales) +2% Fishing Mastery XP |
| 2 | Error creating thumbnail: File missing Monkey Bars | -4% Firemaking Interval |
| 3 | Error creating thumbnail: File missing Pipe Climb | +5% Melee Evasion +5% Melee Max Hit |
| 4 | Error creating thumbnail: File missing Cave Climb | -40 Maximum Hitpoints +5% Ammo Preservation +5% Rune Preservation +5% Melee Max Hit |
| 5 | Error creating thumbnail: File missing Cliff Balance | +20 Maximum Hitpoints +5% Ranged Accuracy Rating +2 Prayer Point Cost for Prayers +5% Magic Accuracy Rating +5% Melee Accuracy Rating |
| 6 | Error creating thumbnail: File missing Lake Swim | +1% Damage Reduction +5% Damage To All Monsters +3% Chance To Preserve Prayer Points |
| 7 | Error creating thumbnail: File missing Boulder Trap | -20% Chance to Preserve Resources in Skills |
| 8 | Error creating thumbnail: File missing Raft Building | +20 Maximum Hitpoints +2% Damage To All Monsters +1% Damage Reduction |
| 9 | Error creating thumbnail: File missing Ice Jump | +20 Maximum Hitpoints +5% Food Healing Value +5% Chance to Double Items Globally +10 Mining Node HP +10% Chance to Preserve Resources in Skills |
| 10 | Error creating thumbnail: File missing Dragon Fight | -16% Auto Eat Efficiency -0.3s Monster Respawn Timer |
| 11 | Error creating thumbnail: File missing Frozen Maze | +1% Damage Reduction -0.1s Monster Respawn Timer -3 Prayer Point Cost for Prayers -20% Rune Preservation -20% Ammo Preservation |
| 12 | Error creating thumbnail: File missing Boulder Balance | -20% Global Accuracy +5% of Maximum Hit added to Minimum Hit -0.1s Attack Interval |
| 13 | Error creating thumbnail: File missing Balance Trap | +10% Agility Interval +5% Chance to Double Items Globally -30% GP gained from Agility |
| 14 | Error creating thumbnail: File missing Freezing Climb | +30% Accuracy Rating +30% Global Evasion -150% GP from Combat -6% Chance To Double Loot in Combat +15% Damage to Monsters in Dungeons |
| 15 | Error creating thumbnail: File missing Waterfall Crossing | -100 Maximum Hitpoints Your Attacks now roll twice (Select highest chance) -10% Global Slayer Coins (except Item Sales) |
| Pillar | Error creating thumbnail: File missing Pillar of Combat | +10% Ranged Evasion -0.2s Monster Respawn Timer +5% Flat Slayer Area Effect Negation +10% Melee Evasion +10% Magic Evasion +5% of Maximum Hit added to Minimum Hit +10 Flat HP Regen |
| Elite Pillar | Error creating thumbnail: File missing Elite Pillar of Expertise | +8% Mastery XP for Melvor Realm only -3% Interval for all Non-Combat Skills +40% Global GP (except Item Sales) +8% Chance to Double Items Globally |
Ancient Relics Guide
There are two different ways of approaching this Dungeon:
- Just get the Dungeon first clear over with as soon as possible to get your Skill Cap Increases and gain access to Error creating thumbnail: File missingImpending Darkness Event. This would include not grinding out
Underwater Ruins for it's weapons. - The second would be to grind (B) God armor pieces and one or more weapons from Underwater Ruins.
General Guidance
Contrary to all previous Dungeons, some minorError creating thumbnail: File missing
Astrology investment is highly recommended. Specifically obtaining the 8% Accuracy stars in the Constellations Error creating thumbnail: File missing
Iridan, Error creating thumbnail: File missing
Terra, Error creating thumbnail: File missing
Vale, Error creating thumbnail: File missing
Syllia and Error creating thumbnail: File missing
Arachi. The Master Relic will not be required, nor will any other Stars.
Due to the regen mechanics of both the Barrier and Health of the boss, it would be advised to Manual Eat as little as possible, for this reason as much Damage Reduction as possible will be packed on for this Dungeons Boss Error creating thumbnail: File missing
Nagaia. Additionally, because of the high regen capabilities of the Monsters
Barrier it is highly recommended to follow the Combat Triangle, this means a Error creating thumbnail: File missing
Ranged setup for waves 1 and 2, Melee for waves 3 and 4, Error creating thumbnail: File missing
Magic setup for waves 5 and 6, Error creating thumbnail: File missing
Ranged for waves 7 and 8, and finally Melee for the 9th and final wave. Active switching styles is highly recommended as the Dungeon will go much faster this way. A setup for each combat style is included in this guide. While it is entirely possible to do this Dungeon completely Idle at this point, however it depends greatly on which Relics have been obtained.
Following the instructions and suggested setups from this guide will not require Manual Eating at all. However it will require switching between Combat Styles to the suggested Style listed in the above paragraph.
Eradicating Gloves (m) are the Best in Slot gloves for the rest of the game, they however have a very low drop chance. It most likely isn't worth farming for these gloves until you have both a few (B) Terran God Armour set pieces and Error creating thumbnail: File missing
Summoning Relic #4.
Option 1: Rush First Clear
These setups notably do not require:
- Any Weapons from Underwater Ruins
- Any (B) God Armors
- Error creating thumbnail: File missingLevel 99 (for
Imbued Dragonite Bar) - Over Error creating thumbnail: File missingLevel 50, Obstacle 6 is good enough.
See the specific sections for advice per style.
Agility
This guide assumes thatError creating thumbnail: File missing
Agility has not been progressed beyond obstacle 6, as it is very slow to level before beating Error creating thumbnail: File missing
Impending Darkness Event.
| Slot | Obstacle | Bonuses |
|---|---|---|
| 1 | Error creating thumbnail: File missing Cargo Net | +3% Global GP (except Item Sales) +2% Fishing Mastery XP |
| 2 | Error creating thumbnail: File missing Rope Jump | +3% Smithing Mastery XP |
| 3 | Error creating thumbnail: File missing Pipe Climb | +5% Melee Evasion +5% Melee Max Hit |
| 4 | Error creating thumbnail: File missing Coal Stones | -4% Global Skill XP +10% Food Healing Value +20% GP gained from Thieving +3% Chance to Preserve Resources in Skills |
| 5 | Error creating thumbnail: File missing Cliff Balance | +20 Maximum Hitpoints +5% Ranged Accuracy Rating +2 Prayer Point Cost for Prayers +5% Magic Accuracy Rating +5% Melee Accuracy Rating |
| 6 | Error creating thumbnail: File missing Lake Swim | +1% Damage Reduction +5% Damage To All Monsters +3% Chance To Preserve Prayer Points |
Melee
Used for waves: 3,4,9
This is the setup that will be used for the boss, attempting any other style will result in Death at this stage.
It will require at least 70% Damage Reduction and 1010Error creating thumbnail: File missing
HP or 71% if you're want to be 100% safe. (70% has roughly 0.004 Deaths per hour, 71% eliminates the Death Chance entirely) You can replace Fury of the Elemental Zodiacs and 
Tormented Ring with any combination of Amulet and Ring of choice as long as 2/3% Damage Reduction is gained from those 2 Item Slots combined.
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Defence Relic #5 provides a bite more wiggle room replacing the need for Damage Reduction from either Amulet or Ring, if this Relic is obtained it 
Adaptive Summoning Amulet and Tormented Ring would be the best options.
Gear
Sunset Rapier or 
Ancient Claw can be used instead of 
Infernal Claw for slightly lower clear speed.
- Potion: Damage Reduction Potion IV
- Prayers: Error creating thumbnail: File missingChivalry &Error creating thumbnail: File missingBattleheart
- Point of Interest: Dark Waters
Ranged
Used for waves: 1,2,7,8
TheError creating thumbnail: File missing
Ranged requirements are much lower than Melee and require much less in terms of investment. 
Siphoning Barrier Gem can be replaced with either 
Draining Barrier Gem or 
Eroding Barrier Gem with little impact on Clear Speed.- Error creating thumbnail: File missingAncient Crossbow has about 50% faster Clear Times than
Dragon Crossbow. 
Engulfing Vortex Longbow/
Ancient Arrows has about 250% faster clear times than Dragon Crossbow
- Potion: Damage Reduction Potion IV
- Prayers: Error creating thumbnail: File missingSharp Vision &Error creating thumbnail: File missingBattleheart
Point of Interest: 
Bandit Hideout (not required to switch from Dark Waters, the benefits on these Monsters is very small)
| Slot | Item |
|---|---|
 |  Aeris God Helmet |
 |  Aeris God Platebody |
 |  Aeris God Platelegs |
 |  Aeris God Boots |
 |  Aeris God Gloves |
 |  Ancient Infernal Cape |
 |  Lesser Summoning Amulet |
 |  Deadeye Ring |
 |  Eroding Barrier Gem |
 |  Dragon Crossbow |
 |  Scaled Shield |
 |  Emerald Bolts |
 |  Elder Crown |
 |  Ranged Hinder Scroll |
 |  Tortoise  Error creating thumbnail: File missing Dragon |
Magic
Used for waves: 5, 6
TheError creating thumbnail: File missing
Magic requirements are much lower than Melee and require much less in terms of investment. - Siphoning Barrier Gem can be replaced with either Draining Barrier Gem or Eroding Barrier Gem with little impact on Clear Speed.
Cloudburst Staff has about 50% faster Clear Times than 
Magic Wand (Elite)
(G) Rune Shield.
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Merman Guard is not that difficult and can be done with Melee instead, which will be slower but one less combat set to set up.
- Spell: Error creating thumbnail: File missingFire Surge orError creating thumbnail: File missingWater Surge with Cloudburst Staff
- Potion: Damage Reduction Potion IV
- Curse: Error creating thumbnail: File missingAnguish III
- Aurora: Error creating thumbnail: File missingSurge II (Optional)
- Prayers: Error creating thumbnail: File missingMystic Mastery &Error creating thumbnail: File missingBattleheart
- Point of Interest: Dark Waters
| Slot | Item |
|---|---|
|  Glacia God Helmet |
|  Glacia God Platebody |
|  Glacia God Platelegs |
|  Glacia God Boots |
|  Glacia God Gloves |
| Ancient Infernal Cape |
| Lesser Summoning Amulet |
|  Warlock Ring |
| Eroding Barrier Gem |
|  Magic Wand (Elite) |
|  (G) Rune Shield |
| Elder Crown |
|  Magic Hinder Scroll |
| Tortoise Error creating thumbnail: File missing Dragon |
Option 2: Take it slow and grind
This is a list of the most effective things to do (assuming sufficient skill cap) to make Option 1 faster and safer.
Key upgrades over Option 1:
- Unlock Underwater Ruins for better weapons. Requires Error creating thumbnail: File missingLevel 90,Error creating thumbnail: File missingLevel 90,Error creating thumbnail: File missingLevel 81.
- Engulfing Vortex Longbow, from Error creating thumbnail: File missingMermaid Archer.
- This will be the best Error creating thumbnail: File missingRanged weapon all the way untilError creating thumbnail: File missingLevel 120...
- ... with the possible exception of
Divine Crossbow and 
Divine Javelin, which require Error creating thumbnail: File missingLevel 111,Error creating thumbnail: File missingLevel 112, andError creating thumbnail: File missingLevel 119 for both.
- This will be the best
Water Pulse Staff is also a very good weapon which will last until Error creating thumbnail: File missingLevel 120- It is slightly worse than Error creating thumbnail: File missingRunecrafting alternatives but does not requireError creating thumbnail: File missingRunecrafting to be leveled above around Level 85.
- However, Error creating thumbnail: File missingLevel 112 may be desired to unlock Archaic spells.
- It is slightly worse than
- These enemies also drop
Devouring Barrier Gem. - If a Magic Set is chosen,
Malevolent Ward Shield can be obtained from 
Lost Temple (since Lost Temple is required to unlock Underwater Ruins anyway), this is a small upgrade.
- Craft (B) versions of God Armour, e.g.
Terran God Platebody (B)
- This requires Error creating thumbnail: File missingLevel 99 and a lot of
Barrier Dust for Imbued Dragonite Bar - which fortunately will be obtained while farming for Engulfing Vortex Longbow.
- When crafting Imbued Dragonite Bar it is highly advised to get as much +1 additional resource chance as possible (Smithing Relic #3 50%,
Mining Lantern 30%, 
Ragnar Dungeon Ruins 10/20%, 
Magic Anvil 10%), as well as getting the stacking/separate extra resource modifier from the Error creating thumbnail: File missingEnt
Error creating thumbnail: File missingSalamander Synergy. - When all these buffs are obtained, it should lower the amount of Barrier Dust needed for a complete set from 96,000 to roughly 43,600.
- Some Imbued Dragonite Bar will be obtained from Cult Grounds while grinding out the Siphoning Barrier Gem required for the (B) upgrades, this is however an unreliable way to obtain Imbued Dragonite Bar as it will require 241 clears on average to get enough bars for 1 piece.
- When crafting
- It is advised to upgrade Terran God Armour first, particularly the
Boots, 
Platelegs and Platebody. The Helm and Gloves will be replaced at a later point with the 
Necromancers Palace Summon Set and thus have a lower priority to be upgraded at this point.
- This requires
When going for this option, making the choice to do the Underwater Ruins grinding before 
Underwater City can be worth it as you also gain (B) God Armour from doing this, making the clear speed on Underwater City faster.
The setups from the first method can be applied to this method, simply replace any gained (B) Terran God Armour for their normal counterparts.
Also be sure to use Devouring Barrier Gem over Siphoning Barrier Gem.
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| Melvor Idle version v1.3 (Released: 13th June 2024) | ||||||||||||||||||||
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| Reference Tables: Items, Equipment, Experience Table, Upgrading Items, Combat Areas, Slayer Areas, Dungeons, Strongholds, The Abyss, Monsters |
