Boon of Siberys

Source: Eberron: Forge of the Artificer

Epic Boon Feat (Prerequisite: Level 19+, Eberron Campaign)

You gain the following benefits.

Ability Score Increase
Increase one ability score of your choice by 1, to a maximum of 30.

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).

Spell	Suggested Dragonmark
Animal Shapes	Handling
Control Weather	Storm
Demiplane	Making
Heroes' Feast	Hospitality
Maze	Warding
Mind Blank	Sentinel
Plane Shift	Passage
Project Image	Shadow
Regenerate	Healing
Symbol	Scribing
Teleport	Finding
True Seeing	Detection