Greater Mark of Shadow

Greater Mark of Shadow
Feat
Prerequisite: Level 4

You gain the following benefits.
Improved Intuition.
When you use the Cunning Intuition benefit of your Mark of Shadow feat, you can roll 1d6 instead of 1d4.
Improved Shadow.
When you use the Shape Shadows benefit of your Mark of Shadow feat to cast Invisibility without a spell slot, you cast the spell as its level 3 version.

Source: Eberron: Forge of the Artificer (EFA), page 45