Some boons represent the culmination of acquired skill and trꦅaining, like the boons of skill proficiency, peerless aim, and combat prowess.

Turning these from magical effects to acquired techniques means the player gets to roleplay acquiring the boon each time they use it.

When a player uses the Boon of Combat Prowess to turn a miss into a hit, describe the masterfully performed fe♓int that enabled the strike.

Epic-level boons are intended to represent a character's ascension beyond mortality. Having a deity or great power be𝔉stꦬows the power can mean anything from them paying respects to the new neighbour, or buying favour with a future great power.

In both cases, you can have the character interact directly with the great power as part of the process of gaining the boon.

A good-aligned paladin or cleric might gain the boon of planar travel, bound to Elysium and allowed to visit the domain of their patron deity.

Other boons can be rewarded after an influential event that changes a character's nature. The boon is no longer a mechanical bonus but a part of the character's story.

Negotiate with the player about whether this ordeal manifests as some form of visible scarring.

The complete immunity to fire damage represented by the boon of the fire soul deserves a memorable scene like the character being dipped in the River Styx.

While the benefits of a booꦫn should outweigh the consequences, it isn't a bad idea to give the boons consequences that keep the🐻m memorable.

These should be specific to the boon itself or the way it manifests visually on a character changing how people interact with them.

The boon of undetectability denies the effects of both beneficial and harmful divination magics. They can't benefit from guidance or ca🤪st helpful divination spells such as tongues.

You could also take it in a different direction and have the boon distort people's ability to remember the identity or name of an undetectable character.

Gain a ninth-level spell slot

Gain an additional spell slot equal to your highest-level spell.

This boon will gradual💞ly unlock the same power as its epic version, but stay relevant at each point of a character💮's growth.

Half-casters and warlocks will be able to use this boon.

Cast misty step once per rest.

None

🌱A second-level spell slot is not game-breaking at any point beyond third level.

You could even buff the epic version to be usable several times (equal to proficiency modifier per long rest, for example).

Add a d10 to a roll once per rest

None

These boons give a nice bonus to different types of rolls, but average out to the same bonus as a point of inspiration or a charge of the lucky feat.

Gain +40 hitpoints

Gain +2 hitpoints per level.

This is functionally the same as the tough feat but has a cooler name.

Once per rest, reduce the damage from an effect to 0.

Once per long rest.

This one seems intimidating but the player won't know when the best time to use it is: It isn't going to be blocking disintegration once per day but will instead be about on par with a half-orc's Relentless Endurance.

Cast any known spell onc꧙e p⛄er rest, even if not prepared.

None

For games that closely track prepared spells, this is a very strong tool in the hands of a Wizard. Otherwise, it's functionally the same aꦰs the boon of High ♋Magic.