Wizard Arcane Thesis: Spell Blending
This thesis treats spell slots as interchangeable currency, letting a wizard trade lesser slots during preparation for one stronger casting.
You theorize that spell slots are a shorthand for an underlying energy that powers all spellcasting, and you've found a way to tinker with the hierarchy of spell slots, combining them to fuel more powerful spells. During your daily preparations, you can trade two spell slots of the same spell rank for a bonus spell slot of up to 2 spell ranks higher than the traded spell slots.
Option Family Wizard Arcane Thesis
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