Greater Mark of Sentinel
Source: Eberron: Forge of the Artificer p. 44
Prerequisite: 4th
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 Sentinel’s Intuition benefit of your Mark of Sentinel feat, you can roll dice:1d6|noform|noparens|avg (1d6) instead of dice:1d4|noform|noparens|avg (1d4).
Improved Sentinel. When you use the Vigilant Guardian benefit of your Mark of Sentinel feat, you can also make one attack with a weapon or an Unarmed Strike as part of that same Reaction.