You can sacrifice your physical health to fuel a spell. This process leaves you wracked with pain, but the additional power you draw from the spell might provide the margin between victory and defeat.
You have bonus hp equal to level of the highest spell level slot you have.
Three times per day as a swift action, you can regain a spell you've cast today. In return, you take a -4 accumulative penalty to Constitution for 12 hours and are fatigued, but this penalty cannot bring you under 6 total Con.
