While in the area, foes suffer from -15 Health degeneration.
Concise: Foes in the area have -15 Health degeneration.
Life Drain is an Environment Effect encountered in Urgoz's Warren. Kill the corresponding Twisted Bark to end this effect. Heal Party is an ideal way to deal with Life Drain when necessary. Countering with regeneration is generally ineffective, seeing how one would need a +9 Healing Breeze just to go up to -6 degeneration.