You gain the ability to delve into insanity, and a special meter: Sanity Points. You have Sanity Points equal to 20+(4x(your Intelligence mod+your Wisdom mod+your proficiency bonus)). You regain Sanity Points equal to 5d4+your Int mod+your Wis mod+your prof bonus whenever you finish a long rest. If you lose Sanity points equal to or past (your Int mod+your Wis mod) in the space of 1 day, you take 4d6 psychic damage that cannot be reduced or avoided and must make a DC (13+the number of points lost) Intelligence or Wisdom saving throw(your choice), gaining a form of long-term madness and going insane for 5 minutes on a failed save. While insane, you are under the DM's control, and may not remember anything that occurred while insane. If you lose all Sanity Points, you take 10d6 psychic damage that cannot be reduced or avoided and you gain a form of indefinite madness, in addition to becoming insane until you regain at least 1 Sanity Point. While insane in this way, you cannot regenerate Sanity Points normally, but regain 1 Sanity Point if greater restoration is cast on you. In addition, every 2d6 long rests, you can make a DC 30 Intelligence or Wisdom check (your choice), regaining 1 Sanity point on a success
When you cast a spell, instead of expending a spell slot for it, you can expend a number of Sanity Points equal to twice the spell's level, minus half your Prof bonus rounded up(minimum 0 Sanity Points expended). You can also, if you have spellcasting ability, expend Sanity points in the same way to regain spell slots.
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