From Lexicanum

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Biomancy is a psychic discipline known to psykers which specialises in the use of manipulating biological energy as well as processes through the power of the mind. Through this art, biomancers are capable of changing or influencing a change in the physical form of either themselves or their enemies.

Abilities

• Blood Boil : by reaching into an enemy's body with their mind, a psyker can rapidly accelerate their pulse and blood pressure to lethal levels with the end result being the victims heart and brain exploding.
• Choke : through a simple gesture a psyker reach out with their abilities and close tight the windpipe of their intended victim thus choking them of their breath.
• Enfeeble : a biomancer can drain the vigour of their enemy thus making them feel weak and incapable of acting.
• Hammerhand : through this power, a user can harden the flesh and skin of their first thus hardening tendons and strengthening the muscles of the arm which enhances their physical strength.
• Regenerate : a psyker with the appropriate knowledge can reach into the very cells of their target and begin knitting together flesh and bind the wounds through their mental abilities alone.
• Storm of Lightning : this psychic bolt of bio-electrical energy can leap from a biomancers fingertips which can jump from victim to victim.
• Warp Strength : a psyker can invigorate a target with psychic energy by channeling the power of the Warp through their muscles, tendons and even bones which enhances their strength to remarkable levels.¹

Source

• ¹:Inquisitor Inquisitior Rulebook Part 1 (pg 49)