Tenacity

A character's Tenacity is effectively his spiritual endurance. Every time a character casts a spell or invokes a power, the cost of that spell adds towards the character's Tenacity. Any spells that go over this threshold deals the difference in Sublethal Damage, bypassing the normal DR for sublethal damage.

Tenacity is determined through the following formula:

Tenacity = Constitution x (Capacity/2)

A character's Tenacity is completely cleared from full over the course of an hour.