Dead Inside is a colorless mutation which increases maximum health by 50%, but also reduces the power of all healing effects by 50%, such as from the Health Flask, food, and mutations such as Necromancy.
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Max health of the player is increased by 50%.
Healing effects from all sources are reduced to half.
Due to the health buff that this mutation provides, the actual amount of health points that are restored by percentage-based healing is actually only reduced by 25% compared to without it.
The only healing decreased by the full 50% is that from the Poison Heal amulet affix.
This mutation has a slimy-green color around it, which no other colorless mutation in the game shares.