Primal Hierophant

Level 19

You command the most potent forces of primal magic and can cast a spell of truly incredible power. You gain a single 10th-level spell slot and can prepare a spell in that slot using primal spellcasting. Unlike with other spell slots, you don’t gain more 10th-level spells as you level up, though you can take the Hierophant’s Power feat to gain a second slot.