Shub-Niggurath

Shub-Niggurath is an religious entity from YGGDRASIL.

Personality
Given it requires sacrifices to receive Shub-Niggurath blessings, it can be assumed that she is somber and sinister.

Background
According to Ainz Ooal Gown, when one makes an offering to the Black Goddess of the Bountiful Harvest, she will reciprocate with a gift of her offspring.

The Magic Caster of Destroy Arc
Ainz referred her briefly to Nimble Arc Dale Anoch after his Super-Tier Spell was casted and resulted in death of 70,000 members of the Royal Army.

Abilities and Powers
Shub-Niggurath seems to be connected to the Super-Tier Magic Spell, Iä Shub-Niggurath. The spell summons her children, the Dark Young which are level 90 monsters speaks volumes of the goddess's power.

Trivia

 * Shub-Niggurath is Cthulu Mythos deity created by H. P. Lovecraft, appearing in his story "The Last Test" (1928).
 * The Super-Tier Spell, "Iä! Shub-Niggurath!" is actually a mysterious expression used in H.P. Lovecraft's "Necronomicon".
 * It is unclear if Shub-Niggurath in YGGDRASIL exists as an Non-Playable Character like most deities in the game or is flavor text for Iä! Shub-Niggurath!.