Dragonmark, Greater Mark of Detection

Most dragonmarks are small—no more than the size of the bearer's palm—and grant limited magical power. And even these minor marks are rather rare. But rarer and more powerful marks appear on some individuals, both within and outside the dragonmarked houses. Greater dragonmarks manifest only on people who already possess an ordinary mark. When a greater dragonmark manifests, it grows from an ordinary mark and expands outward to two or three times the original mark's size. The dragonmarked houses view greater marks as more significant than ordinary marks in every way—more important to the livelihood of the house, more essential to keep under the house's control, and potentially more significant in terms of fulfilling the Draconic Prophecy that some believe is written in the marks.

You gain the following benefits:

Ability Score Increase. Increase one ability score of your choice by 1, to a maximum of 20.

Improved Intuition. When you use the Deductive Intuition benefit of your Mark of Detection feat, you can roll 1d6 instead of 1d4.

Shared Detection. When you use the Magical Detection benefit of your Mark of Detection feat to cast See Invisibility without a spell slot, you can choose one creature you can see within 30 feet of yourself. That creature also gains the benefits of the spell for its duration.