The berserk blood essence is one of the blood essences players can craft after the quest River of Blood. Using Haemalchemy, players can combine 100 congealed blood with a 4-dose weapon poison++ potion; doing so requires at least 400 vyre corpses to be cremated in the Columbarium. When received as a one-time gift from Vanescula Drakan after the quest or created manually, it will have 1,000 charges. Additional charges can be added by using more congealed blood on the essence, giving 10 charges each, to a maximum of 5,000 charges. If charges are completely exhausted, the essence's effects no longer function, but it can still be worn.
According to the book Haemalchemy (Vol. 2), this blood essence is described as:
This essence will passively increase the amount of testosterone in your blood, and when consumed it will flush a near-lethal dose of the hormone around your system.
| Requirements | Tier | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| None | None | ||||||||||
| Class | Slot | Attributes | |||||||||
| None |  |  Armour | 0 | ||||||||
 Life points | 0 | ||||||||||
| Weapons | Main | Off |  Prayer | 0 | |||||||
| Damage | - | - | Damage reduction | ||||||||
| Accuracy | - | - | PvM: 0% | PvP: 0% | |||||||
| Style | - | Style bonuses | |||||||||
| Range | - |  0 |  0 |  0 | |||||||
| [FAQ] • [doc] | |||||||||||
Mechanics[]
When worn, it has a passive effect that has a chance of boosting your offensive stats based on main hand weapon style by (14% + 2) for 4 seconds when taking damage. When activated, it boosts your offensive stats based on main hand weapon style by (14% + 2) for 20 seconds. Both effects stack with other boosts, but neither can activate while under the effects of overload; attempting to use the active effect gives a message: A more powerful effect is active.
A popular usage of the essence is to, instead of using supreme overload potions (because it doesn't work with them), is to use their inferior versions: supreme potions (boosts the same amount, just doesn't stay at a consistent 118 boost). Because the berserk blood essence stacks with already boosted stats, you can get up to 136 in your chosen combat stat, for the 20 seconds the effect lasts. The use of the Berserker curse is recommended to help slow down the degradation of stats.
The active effect can be used once per minute. This cooldown is shared with other blood essences, except the tireless essence. Unlike the other blood essences this active cannot be used in PvP zones. Each activation of the passive effect consumes 1 charge and each use of the active effect consumes 50 charges.
There is a bug associated with the berserk blood essence where if the passive effect triggers while the user switches to a shield with no main hand weapon equipped, all boosted combat stats expire immediately. If the user fights with two or more combat styles, boosts those combat stats, and wears the berserk blood essence, its passive effect will remove the boosted stats of the other combat styles that is not of the style they are currently using.
Having a blood essence equipped and attempting to enter the Mausoleum notifies the player "You have a blood essence equipped which makes the ravenous ghouls aggressive. Are you sure you wish to proceed?"
Cost[]
| Cost of charges | ||
|---|---|---|
| Blood essence | Price per 1 passive effect | Price per activate |
| Berserk | 6.9 | 345 |
| Cost of producing | ||
| Weapon poison++ (4) | Congealed blood x100 | Total price |
| 21,610 | 6,900 | 28,510 |
| Blood essences |
 Vampyric Penance Aegis Reflecting Berserk Tireless |
