
Epic Boon Feat (Prerequisite: Level 19+)
You gain the following benefits.
Ability Score Increase. Increase your Intelligence, Wisdom, or Charisma score by 1, to a maximum of 30.
Free Casting. Whenever you cast a spell with a level 1–4 spell slot, roll 1d4. If the number you roll is the same as the slot’s level, the slot isn’t expended.

This doesn't really seem that powerful to me. Does anyone else have any thoughts?
Yeah, this is pretty lacking. This is the only boon that has a "benefit" beyond score improvement that has no guarantee of ever working.
I guess it would be good for a paladin, ranger, arcane trickster, or eldritch knight? It seems kind of underwhelming but most/all of your spells would be 1st-4th level. I wonder if this would actually benefit regular divine smite...
This should be:
Ability Score Increase. Increase your Intelligence, Wisdom or Charisma score by 1 to a maximum of 30.
Free Casting. Choose 4 spells between 1st - 4th Level from a class you have levels in and appropriate spell slots for. They do not cost a spell slot to cast with this feat.