Soul Caster

You have gained the ability to connect your soul to the Weave. You can tap into your own life essence to call forth extra spell slots. For each spell slot summoned, you lose 5 hp from your current hit points, as well as your hit point maximum, per level of the slot summoned. For example, summoning a first level spell slot costs 5 hp, but a 6th level spell slot costs 30 hp.

You regain half of the expended hit points back to your hit point maximum on a long rest (rounded down). A Greater Restoration or Wish spell can fully restore your hit point maximum instantaneously.

If using this feature reduces you to zero hit points, your soul is sundered and you die instantly. If killed in this way, you can only be restored to life by a True Resurrection or Wish spell.