nice one  , allows rouges to use magic:D

Prerequisite: Gnome (deep gnome)

Then why can use it when i'm a Tiefling?

I’m a Half-Elf and I have it too some reason...

Does that thing uses spell slots for sorcerers?

This feat has really good synergy with Deep Gnome Abjuration wizards. Nondetection at will can bring your Arcane Ward back up to full by casting it over and over (out of combat of course).

Quote from XemiaHearts >>

Prerequisite: Gnome (deep gnome)

Then why can use it when i'm a Tiefling?

 I've the exact same question :c

Does casting Blur, Blindness/Deafness, and Disguise Self involve checking off one of your spell slots? Or are these spells separate from your list of prepared spells???

doesn't use your spell slots Lord Henry.  They're once per long rest, and instead of clicking the CAST button on DNDBEYOND, which automatically uses a slot, it's a USE button.

I thought it was just for gnomes?????

Quote from KAMU >>

nice one  , allows rouges to use magic:D

 

 I think someone's forgetting about arcane tricksters

Quote from ralph2190 >>

This feat has really good synergy with Deep Gnome Abjuration wizards. Nondetection at will can bring your Arcane Ward back up to full by casting it over and over (out of combat of course).

 I have actually made a build like this and I agree that this is quite powerful, but the cool thing is that is not the entire feat and blur  helps with your survivability too

Deep Gnomes with Svirfneblin Magic make the absolute best Rogues!

Because it is a racial feat. Just like the feats that Tieflings can use. 

I don't know why Deep Gnomes should not get this as a part of their race.  It does not make sense.  It is part of who they are.

I don’t believe that to be the case. I feel that just pushes deep gnome to be the objective ‘correct’ choice when playing a gnome, let alone a martial character looking for a pinch of spellcasting. Being innately able to cast a 3rd level spell (albeit, only on yourself) and two 2nd level spells from level 1 inherently breaks the symmetry of the game, even if only in a somewhat niche fashion.

My understanding is, these are inherent traits and do not require spell slots.

Because it's for Gnome (deep gnome) not you

Cuz you ,my friend, are a gangster

One of the characters in my campaign has this when they are not meant to, and I have no idea how to remove it.

They are a homebrew race, and I have 2 other players with the same homebrew race that do not have this racial feat, I am so confused. 

Shoot, this feat is kind of useless now with the MoM update.