Monster Respawn Timer

After killing any monster, there will be a respawn time of 3 seconds before the next monster appears. During this time the player cannot deal damage, and therefore cannot gain XP. This means that a monster respawning can be considered a guaranteed miss (or two). Respawn time is capped at 0.25s.

Sources

The Unhallowed Wasteland effect can be doubled if the player has Carthulu

Source	Type	DLC	Monster Respawn Timer	Other Modifiers
Error creating thumbnail: File missing Frozen Maze	Agility Obstacle 11		-0.1s Monster Respawn Timer	+1% Damage Reduction -3 Prayer Point Cost for Prayers -20% Rune Preservation -20% Ammo Preservation
Error creating thumbnail: File missing Pillar of Combat	Agility Pillar		-0.2s Monster Respawn Timer	+10% Ranged Evasion +5% Flat Slayer Area Effect Negation +10 Flat HP Regen +10% Magic Evasion +5% of Maximum Hit added to Minimum Hit +10% Melee Evasion
Candle Lamp (Lit)	Item (Consumable)		-0.2s Monster Respawn Timer	+4% Attack Skill XP +4% Strength Skill XP +4% Defence Skill XP +4% Hitpoints Skill XP +4% Ranged Skill XP +4% Magic Skill XP +4% Slayer Skill XP +4% Prayer Skill XP -4% Alt. Magic Skill XP +25 GP gained when hitting with an attack
Error creating thumbnail: File missing Crimson Lantern Stick	Item (Shield, Passive)	Error creating thumbnail: File missing	-0.2s Monster Respawn Timer	+50 AP from Monster drops +4% Corruption Abyssal XP
Error creating thumbnail: File missing Enhanced Township Food Scroll	Item (Consumable)	Error creating thumbnail: File missing	-0.2s Monster Respawn Timer	+3% Fishing Abyssal XP +5% Chance to gain +1 additional resource in Cooking (Cannot be doubled) -10% damage taken from dragonbreath +3% Fishing Skill XP
Hunters Hat	Item (Helmet, Passive)		-0.2s Monster Respawn Timer
Harold	Pet		-0.2s Monster Respawn Timer	+5% Accuracy Rating +5% Global Evasion +3% Chance to preserve Summoning Charges -0.1s Attack Interval +3% Chance To Preserve Potion Charge +5% Global GP (except Item Sales) +5% Global Slayer Coins (except Item Sales) +5% Mastery XP in all Skills +50% Mastery Pool XP Cap +2% of Maximum Hit added to Minimum Hit -2% Interval for all Non-Combat Skills +3% Ammo Preservation +3% Rune Preservation +2% Chance to Double Items Globally
Unhallowed Wasteland	Point of Interest		-0.25s Monster Respawn Timer	-100% GP from Combat -100% Chance To Double Loot in Combat
Error creating thumbnail: File missing Lava Jump	Agility Obstacle 9		-0.3s Monster Respawn Timer	-6% Damage Reduction -6% Auto Eat Efficiency -6% Mastery XP in all Skills
Error creating thumbnail: File missing Dragon Fight	Agility Obstacle 10		-0.3s Monster Respawn Timer	-16% Auto Eat Efficiency
Slayer Relic 4	Ancient Relic		-0.3s Monster Respawn Timer
Summoning Lesser Relic	Item (Consumable)		-0.3s Monster Respawn Timer	-5% Summoning Interval +15 base primary resource quantity gained in Summoning