Somatomagic

You can sacrifice your own body for greater control over the spells you cast. You gain 3 somatomagic die. They are d4. You can use them to power the below somatomagic abilities. You can never have more or expend more than 3 somatomagic die at once. You regain all spent somatomagic die at the end of a long rest.

You can create a somatomagic die by expending a hit die. You can create a somatomagic die as part of the action in which it is used. You gain 2 of the somatomagic abilities listed below. When you complete a long rest, you can replace one of the somatomagic abilities you know with one that you do not.

As you practice somatomagic, you become more efficient drawing off of the resources of your own body. At 5th level, the somatomagic die you gain from this feature become d6. At 9th level, it becomes a d8, which you can make more of by expending 2 hit die. At 13th level, the somatomagic die you gain from this feature become d10, which you can make by expending 2 hit die. At 17th level, they become d12, which you can make by expending 3 hit die. As you develop this capacity, you can continue create d6 somatomagic die by expending 1 hit die, and, after reaching 13th level, d10 somatomagic die by expending 2 hit die.

When you expend somatomagic die to power somatomagic abilities, the expended die must all be of the same size.