Boon of Siberys

Prerequisite

Level 19+, Eberron campaign

Ability Score Increase

+1 to any ability score (max 30)

Source

EFA

You gain the following benefits.

Aberrant Magic

Choose a level 8 or lower spell from the Sorcerer spell list or a spell from the Siberys Dragonmark Spells table (the table includes dragonmark suggestions if you'd like to associate a spell with one of the marks). You always have that spell prepared. You can cast it once without a spell slot or spell components, and you regain the ability to cast it in that way when you finish a Short or Long Rest. You can also cast this spell using any spell slots you have of the appropriate level. Intelligence, Wisdom, or Charisma is your spellcasting ability for this spell (choose when you gain this feat).