Hyper-casting

Transcendence

You can cast two spells using one action. You still expend the energy for each spell.
When you use this ability, roll a hit die. You lose a number of hit points equal to your roll and your hit point maximum is lowered by the same amount.
The number of dice you roll increases by 1 for every time this ability is used. Your hp max and number of dice rolled both reset when you finish a long rest.