Describe the magic you want to take place. You are not constrained by the spell list. The GM will tell you the cost in HP based upon its potency compared to the listed spell levels.
Special preparations or limitations may adjust this cost. HP spent in this way may not be recovered except through Rest.
Roll INT + the spell’s “level”, rolling with Disadvantage if the HP cost might kill you. Failure means unintended consequences, including but not limited to Magical Mishap. Successfully casting a spell this way three times lets you add it to your spellbook as a “normal” spell during your next Long Rest.
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