A mark that connects the user to the astral plane. While physically weakening the user it increases the users magical Ability. The spell casting mod is whichever is higher out of INT, WIS or CHA. After certain encounters the spell list grows. At the end of a long rest roll a d4 to see how many time you can use the mark until you long rest (you can use the mark as much as you please on the astral sea). The mark gives you -2 to AC until the start of your next turn.
Spell List: Mind Sliver