Change Fate

When casted, it fully heals and has a chance to change ones fate. Roll a d100, and above or bellow 50 decides if it's changed or not. Above, it's changes, bellow, it says. The caster WILL die even if fate hasn't changed. This spell can be casted ONCE per campaign. 

This is meant as a last resort spell.

Presentation and song can be determined by the user.