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Blood Burst is the second tier Blood spell from the Ancient Magicks spellbook, available at level 68 Magic after completion of the Desert Treasure I quest. It is capable of hitting up to 21 damage (without any magic damage boosts) per cast.
Blood Burst has a life leech effect that will heal the caster's Hitpoints by 25% of the damage dealt. This can be increased by wearing bloodbark armour, where each piece increases the amount healed by 2%, up to a maximum of 35%. When worn alongside the Ancient sceptre, this increases to 38.5% of the amount of damage inflicted. It is also able to target up to nine targets in a 3x3 grid around its primary target, just like all other burst and barrage spells. Even if a target has very little remaining health or is otherwise immune to damage from the spell, it will still heal for the amount of damage it would have done.