Inhibited Regeneration

Rank	Effect	Flavor
1	No (non-divine) HP regeneration when monsters are in line of sight.	You do not regenerate when monsters are visible.
The regeneration spell will not function when this mutation is active, however Trog's Hand will. Prior to 0.20, this mutation was called slow regeneration, and it had 3 ranks: at rank 1, regeneration was slowed when monsters were visible, rank 2 was the current rank 1, and at rank 3 regeneration was completely stopped. Prior to 0.17, this mutation was called slow healing.
Species Notes: Ghouls start at rank 1. Vampires have this mutation when Bloodless, and thus are unable to get this mutation randomly. Deep Dwarves cannot regenerate and are similarly immune.
Bad mutation