Fortitude

Sii Concept: Fortitude

Each host form you inhabit has an finite ability to repair itself by natural regeneration. Using our ability to focus upon that regeneration, we can temporarily increase the regenerative rate, however doing so will drain the fortitude of the host.

Fortitude is the 'inner strength' of the host form, it's ability to push on past the natural limits, and is not easily regained once used.