Guren

Guren (紅蓮) is an Area Guardian of the River of Flame on the 7th Floor of the Great Tomb of Nazarick.

Appearance
Guren is a giant, abyssal, hellish slime that ambushes intruders from the molten body of the River of Flame.

Background
While Demiurge is absent, Guren guards the 7th floor in his stead.

The Two Leaders Arc
Aura mentioned to Albedo and Shalltear that should intruders defeat her on the 6th Floor they would still need to get past Guren's area on the 7th Floor if they planned on harming Ainz.

Pulcinella later delivered a message to Mare from Demiurge. He mentioned that Mare might need to relay to Guren should he want to send a message back, although he didn't know what it was doing or where it was. Pulcinella informed Mare that the last time he saw Guren was when Demiurge wasn't present and it was lying in ambush around the 7th Floor's gate.

Abilities and Powers
Despite being level 90, Guren's class build is optimized in battle and can overwhelm some of the weaker Floor Guardians. Because Guren surrounds itself in lava, opponents are forced to fight in a battlefield disadvantageous to them.

Demiurge
Guren is Demiurge's direct subordinate and guards the 7th Floor while Demiurge is away.

Trivia

 * In the English publication of the Light Novel, Guren's name was translated as Crimson.
 * Guren means "red lotus" in Japanese. "Guren Hell" in Buddhism is a hell with harsh, cold winds that provoke frostbite, causing the sinners to bleed like red lotuses.