Flask of fervour (item)

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Flask of fervour
Released							15 April 2026 (Update)
Members							Yes
Quest item							No
Properties
Tradeable							No
Equipable							No
Stackable							No
Noteable							No
Options							Activate, Check, Destroy
Destroy							You can get this item back by talking to the Leagues tutor in Yama's lair.
Examine							A flask generously filled with demonic energy.
Values
Value							1 coin
Alchemy							Not alchemisable
Weight							0.004 kg
Advanced data
Item ID							33239
Link							MOID

The flask of fervour is an item obtained during the Demonic Pacts League, given to players who picked the Flask of Fervour relic.

When the Flask is consumed, Hitpoints, prayer points, and special attack energy are fully restored. The player may also use this when their hitpoints reach 0 but has not started the death animation. Over the next 4 ticks (2.4s), three explosions hit all enemies (with some exceptions, see below) within 3 tiles of the player's position at each intervals (follows the player) typeless damage equal to 60% of base Prayer level (30% in PvP). During the active effect, all damage taken is reduced to 0. Venom is cured upon use and sanity is restored to 100%.

The flask has a base cooldown of 3 minutes (300 ticks) which is reduced by 1 tick (0.6s) for each instance of 10 damage dealt in a single hit, meaning that a player who attacks for 40 damage, or deals 2x20 damage reduces the cooldown by 4 ticks (2.4s). Dealing 2x9 damage does not reduce the cooldown. Its own explosion damage also does not reduce the cooldown.

The flask can be retrieved from the Leagues Tutor in Yama's Lair if lost.

• The flask's healing restores the player to their base maximum Hitpoints; it does not overheal even if the player has overheal Demonic Pacts. If the player is above their base maximum Hitpoints upon activation, the increased level will be preserved.
• The damage from the explosion benefits from the Demonic Pact effect that causes recoil and Thorns style effects to deal additional damage equal to 1% of your total defence bonuses.
• Unlike surge potions, the flask's cooldown timer is not paused between delve levels when fighting the Doom of Mokhaiotl.
• The flask is available within The Gauntlet and its explosions work on all enemies. Its cooldown also resets upon entering.

The explosions from the flask do not damage the following bosses:

• Fragment of Seren
• Moons of Peril

• Yama
• Bosses in phases where they are completely immune to damage (eg. Hespori while flowers are active, Abyssal Sire immediately after teleporting the player)

The explosions from the flask do not damage the following enemies:

• Tier 3 or higher vampyres, even if an appropriate weapon is wielded
• Husks, parasites and sleepwalkers in both normal and Phosani's Nightmare

The explosions from the flask deal reduced damage to the following enemies:

• Great Olm
• Alchemical Hydra (normal damage is dealt if lured over the correct vent)
• Chambers of Xeric Guardians
• Skotizo (even if altars are inactive)
• Vyrewatch Sentinel
• The Nightmare/Phosani's Nightmare
  • Parasite

• Despite an empty version of the item existing in the game cache, activating a charged one ingame does not empty it, making it impossible to obtain.

v t e Demonic Pacts League
	The Sage Leagues Tutor Yama's Lair Info Board Leagues Reward Shop Overall guide New player guide Tasks Quests Relics Demonic Pacts
Areas	Varlamore Karamja Asgarnia Fremennik Province Kandarin Kharidian Desert Morytania Tirannwn Wilderness Kourend
Skill guides	Agility Construction Cooking Crafting Farming Firemaking Fishing Fletching Herblore Hunter Magic Melee Mining Prayer Ranged Runecraft Slayer Smithing Thieving Woodcutting
Relics	Tier 1 Endless Harvest Barbarian Gathering Abundance Tier 2 Hotfoot Friendly Forager Woodsman Tier 3 Bank Heist Evil Eye Map of Alacrity Tier 4 Transmute Conniving Clues Butler's Bell Tier 5 Nature's Accord Larcenist Soul Harvest Tier 6 Grimoire Eternal Sustenance Culling Spree Tier 7 Flow State Reloaded Tier 8 Executioner Minion Flask of Fervour
Gameplay items	Arcane grimoire Banker's briefcase Butler's bell Crystal dagger (perfected) Evil eye Fairy mushroom Flask of fervour Forager's pouch Knapsack Map of alacrity Minion whistle Sage's axe Searing boots Transmutation ledger
Echo bosses	Cerberus Kalphite Queen(legs) Dagannoth Kings(Prime • Rex • Supreme) Thermonuclear smoke devil Hespori Grotesque Guardians(Dawn • Dusk • Definitely Not Dusk) Corrupted Hunllef Amoxliatl(Icy pool) King Black Dragon(Black dragon) Echo orbs Asgarnia Desert Fremennik Kandarin Kourend Morytania Tirannwn Varlamore Wilderness Echo equipment Fang of the hound Drygore blowpipe V's helm Devil's element Shadowflame quadrant Nature's recurve Lithic sceptre Crystal blessing Infernal tecpatl King's barrage
Rewards	Trophies Bronze Iron Steel Mithril Adamant Rune Dragon Demonic Pacts Hunter Outfits Tier 1 Hood Top Bottom Boots Set Tier 2 Hood Top Bottom Boots Set Tier 3 Hood Top Bottom Boots Set Ornament kits Demonic axe ornament kit Demonic quill Demonic staff ornament kit Demonic trident ornament kit Items Soulreaper axe (o) Oathplate slayer helmet Radiant slayer helmet Iban's staff (o) Trident of the seas (o) Trident of the seas (e) (o) Trident of the swamp (o) Trident of the swamp (e) (o) Overrides Demonic pacts throne scroll Demonic pacts demon butler scroll Demonic skin contract Impish ritual scroll Impish whistle Other Demonic pacts banner Demonic sceptre