Better Dragonmark (5e Feat)
From D&D Wiki
Aberrant DragonMark, Variant
Prerequisites: Be from Eberron, no other DragonMark
you receive constitution increase of 1 to a max of 20
you gain 2 sorcerer cantrips which you can cast 2 times per long rest, constitution is your spell casting ability for these spells.
DM OPTIONAL - At level 10 you have a 10% chance to gain an Epic Boon, if at 10th level you fail to acquire a Boon, you have a 10 + amount of levels failed % chance to gain an Epic Boon.