Svirfneblin Magic
Source: Mordenkainen’s Tome of Foes p. 114, Elemental Evil Player’s Companion p. 7, Sword Coast Adventurer’s Guide p. 115
Prerequisite: Deep Gnome
You have inherited the innate spellcasting ability of your ancestors. This ability allows you to cast nondetection on yourself at will, without needing a material component. You can also cast each of the following spells once with this ability: deafness, blur, and disguise self. You regain the ability to cast these spells when you finish a long rest.
Intelligence is your spellcasting ability for these spells, and you cast them at their lowest possible levels.