I'm a quitter. I come from a long line of quitters. It's amazing I'm here at all.
I can feel bits of my brain falling away like wet cake.
Any mana. You don't necessarily have to use any crystals:
Mage Knight Walkthrough, p. 16 wrote:
You encounter an ancient altar of some forgotten god. In this case, the token depicts three mana of a particular color. You may activate the altar by paying three mana of that color. If you do, gain 7 Fame immediately, discard the ruins token and mark the space with a Shield token to remember it was you who accomplished this adventure. If you cannot or do not want to pay the three mana, nothing happens.