Mordenkainen Presents: Monsters of the Multiverse

Deep gnomes, or svirfneblin, are natives of the Underdark and are suffused with that subterranean realm’s magic. They can supernaturally camouflage themselves, and their svirfneblin magic renders them difficult to locate. These abilities have enabled them to survive for generations among the perils of the Underdark.

Like other gnomes, deep gnomes can live for centuries, up to 500 years.

Elemental Evil Player's Companion

Forest gnomes and rock gnomes are the gnomes most commonly encountered in the lands of the surface world. There is another subrace of gnomes rarely seen by any surface-dweller: deep gnomes, also known as svirfneblin. Guarded, and suspicious of outsiders, svirfneblin are cunning and taciturn, but can be just as kind-hearted, loyal, and compassionate as their surface cousins.