Crystal Hibernation

The only creature in the game who uses this powerful skill is the dragon Glint. She uses it when her health drops below about 50%. Note that "non-physical" includes weapons that do elemental damage, although mesmer spells and necromancer blood magic spells are, as usual, exempt.

Skill Description
Skill (monster only). For 20 seconds, gain 7 Health regeneration. Whenever you would take elemental damage, gain an equal amount of Health instead.