This spell is a part of the Bio Instability spell chain and can be found in the Bio Instability Rune Stone.
To cast Necrosis is to steal the body. Specifically, it steals the arms - the instruments of a warrior's will and the tools through which strength and skill are expressed. The seniumancer reaches inward, rousing The Worm with purpose. This time The Worm is sent to feast upon flesh, directed along the arms of the target where it begins its quiet, terrible work. The target feels it first as a strange warmth beneath the skin, almost pleasant in the way that numbness can feel like relief before it becomes something worse. Then the sensation fades. The fingers lose their sureness. Their grip loosens without meaning to. The arms that once swung with precision and power now hang heavy and unresponsive, the tissue beneath the skin quietly dying as The Worm feeds.
For the duration of the spell both of the target's arms are afflicted with necrosis. The target cannot make critical hits, as the failing tissue robs them of any precision or force. Their Offensive Power and Bow Power are reduced to zero for the duration as the decay strips the strength from every swing and draw. Any Grip check would also fail as no longer can they feel to control their grip. Should the target attempt to attack at all, they must first succeed on a Hard Athletics check - the body willing but the arms barely able to comply. When the spell ends The Worm withdraws and sensation slowly, uncomfortably returns to the target's arms.
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