The ability to cast spells exceeding your available spell slots.
Max HP is reduced by the level of the spell squared (restores on long rest)
Make a con saving throw of 6 plus the spells level, on a fail take 1 level of exhaustion (see rules in notes below).
L1 Spell: -1 HP / Con Save: 7+
L2 Spell: -4 HP / Con Save: 8+
L3 Spell: -9 HP / Con Save: 9+
L4 Spell: -16 HP / Con Save: 10+
L5 Spell: -25 HP / Con Save: 11+
L6 Spell: -36 HP / Con Save: 12+
L7 Spell: -49 HP / Con Save: 13+
L8 Spell: -64 HP / Con Save: 14+
L9 Spell: -81 HP / Con Save: 15+
Exhaustion (Cumulative)
Level Effect
1 Disadvantage on ability checks
2 Speed halved
3 Disadvantage on attack rolls and saving throws
4 Hit point maximum halved
5 Speed reduced to 0
6 Death
Finishing a long rest reduces a creature's exhaustion level by 1
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