Special thanks to @Darkt for the awesome character card design! There are 6 Essence/Bone tokens and 3 Ghouls in total. If you return a card by flipping Bones(Teacher's Syllabus), you don't trigger exhaustion.
3x Ghoul
Essence Token
For each Essence all opponents have, Graves' attack value is +1.
Attack values against your fighters are -1 for each Essence the opponent has.
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Bone Token
After an opposing fighter with Essence attacks your fighter, flip an Essence they have (If any) and return it to your supply. It is now a Bone Token.
When you maneuver, instead of drawing a card, you may flip 2 Bone Tokens to return a "Jar of Dead" card from the discard pile (If any) to your hand.