Malformation Serum

Recharge 33%, std, melee; you inject a target with a mutagen that causes rapid mutation. A horrible mutant "limb" sprouts from them, complete with at least one eye and a sort of mouth. This limb can, at your direction (using a swift action to give it commands), act according to your wishes, not those of its host. The limb has AC 10 + host Dex bonus (typically doesn't benefit from armor, as armor doesn't morph along with the limb). It has HP equal to a medium damage roll; all damage it suffers, the host suffers too. At zero HP, the limb falls off and dies.

The limb's capabilities are:

• Attack: make a melee attack using the host's unarmed attack, or, if armed, the weapon's stats.
• Retrieve and Item: grab an item within reach, including items held or worn by the host. If held, contest Strength with the host to seize it.
• Interfere: attempt to block any physical action the host takes. This command essentially grants the limb a reaction each round to cause disadvantage to one Strength, Dexterity, or Constitution based action the host takes.
• Grapple: attempt to grapple a target within reach, using the host's unarmed attack stats. Can grapple the host themselves, which has the normal effects of grappling, except that the host isn't immobilized.
• Cast a Spell: if the host has spells, the limb can attempt to cast one of them, using the host's spellcasting ability and energy. It is a horrible mutant limb, so it suffers disadvantage to the check used to cast the spell, and if the final roll is a natural 10 or less, the spell simply fails.