Lord of Helheim

Lord of Helheim is an NPC that inhabit the world of Helheim in YGGDRASIL prior to the game's shutdown.

Appearance
Lord of Helheim is described to be a bearded old man by a guild member of Ainz Ooal Gown.

Overlord Prologue Arc
Because Ainz Ooal Gown arrived before the stone statues, it triggered an automated sequence wherein which it summoned the Lord of Helheim to their designated location and confronting the guild members in the process.

Abilities and Powers
The Lord of Helheim is hinted to be very strong, since a unknown guild member of Ainz Ooal Gown suggested using Longinus, a Twenty-type World Item to eliminate him.

Trivia

 * It is currently unclear whether the Lord of Helheim is one of the boss enemies that got in the way of Ainz Ooal Gown while conquering the Great Tomb of Nazarick.