Over the course of your magical study, you have learned to somewhat control the arcane.
Whenever you cast a spell equal to half of your total level, you may attempt to do a save of the spell's spellcasting modifier (DC = 10 + "Entropy" ). On a success, you do not consume a spell slot, and take half of the spell's level (rounded down) as Entropy. On a failure, the spell slot is consumed, the spell itself doesn't cast and you take the spell's full level as Entropy. All Entropy is reset on long rest.
If at any point you have more than 5 entropy, the universe itself begins to fight back against you. While in this state, if you attempt a Arcane Maelstrom, in addition to gaining Entropy, you take damage equal to the spells level on a success, and twice as much on a failure. This damage cannot be prevented in any way, even through a wish spell.
If at any point you have more than 10 entropy, you lose the ability to cast spells, and all magical effects of weapons and armour stop working until you complete a long rest.
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