Fade Away

Fade Away
Feat
Prerequisite: Race: gnome

Your people are clever, with a knack for illusion magic. You have learned a magical trick for fading away when you suffer harm. You gain the following benefits:
- Immediately after you take damage, you can use a reaction to magically become invisible until the end of your next turn or until you attack, deal damage, or force someone to make a saving throw. Once you use this ability, you can't do so again until you finish a short or long rest.

Source: Xanathar's Guide to Everything (XGE), page 74