From publisher blurb:
Become warped by the chaotic magic of the spellplague
The spellplague resulted from the death of Mystra and breaking of the Weave, which caused waves of blue fire to roll across the Forgotten Realms, burning and twisting those touched by the uncontrolled magic. Those who survived exposure to the spellplague found themselves altered. They gained spellscars. Wonderous and horrifying, these arcane marks granted their bearer magical abilities.
Updated to 5th Edition, this document provides rules for spellscars for use in your Forgotten Realms or homebrew campaigns.
The mechanics included are also usable for divine boons, arcane tattoos, or similar imbued magical powers. They can also function as an alternative to the published rules for Eberron's dargonmarks.