Does the invisibility that the Fade Away racial feat (for gnomes) grants require concentration or would using it drop any spells the user is currently concentrating on?
The wording doesn't specifically say that (you become invisible, you don't cast the invisibility spell). I am unsure of how it works, and can't find the answer online. How does Fade Away work?
The Fade Away feat (XGtE, p. 74) says:
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.
If the feature required concentration, it would say so. Similarly, if it was casting the spell invisibility, it would say so. However, it says neither of those things. As you intuit, you do not need to use concentration for the feat.
