Hardcore

Hardcore mode is a Game Mode released on the 23rd of July 2020 that can be chosen when creating a new character. There is no way to change a character from one game mode to another after creation. Hardcore characters are deleted upon Death and also have several penalties that apply while playing:

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Hitpoints do not passively regenerate
The Bank is limited to a maximum of 108 slots - 20 slots are available initially and a further 88 can be purchased from the Shop. If the
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Into the Abyss Expansion is owned, an additional 88 bank slot can be purchased for 5,000,000 AP each for a total of 196 purchase-able bank slots. Players can gain additional slots to exceed this limit, either permanently through the use of Bank Slot Tokens,
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Rosaniya, or temporarily while the
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Pillar of Generosity is active.
The Combat Triangle penalties for using the combat style that is weak against the current enemy are increased.

Hardcore Mode

Avoiding Death

Nobody likes to lose a character to a simple mistake. This section lists a number of things to look out for in order to not die.

Use Combat Simulator to see if you are safe in a fight. This is especially useful in the late game, where there are more factors at play.
Always check the amount of vital resources before going away: Food, food auto-swap (provided by
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Cooking Upgrade 2), Damage Reduction Prayers, Potions, Summons.
Disable
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Auto Slayer if you don't intend to use it. It is especially important to disable this for Slayer tasks of Master or higher tiers.
The
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Cyclops and
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Yak Summoning synergy provides +3% Damage Reduction when fighting your Slayer task. With Auto Slayer disabled you may be at risk of dying once your task is completed due to losing this bonus.

Sources of Healing

To regain

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Hitpoints

in Hardcore, the choices are restricted to consuming food or using special abilities, since there's no natural regeneration:

Consuming food, gained from monster loot:
- Potatoes from Plant
- Salmon, Lobster, and Shark from Sweaty Monster, Wet Monster, and Moist Monster
- Trout from Raging Horned Elite
Ancient Sword with its 25% chance for Life Leech (25% healing from damage dealt)
Warlock Amulet with its 20% healing from damage done from spells
Elder Crown with its 10% life steal and 100% bleed life steal
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Fervor with its 5% to 20% life steal
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Slayer Shop

Or from a variety of other non-combat sources:

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Cooking
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Farming
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Thieving
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Township