# Hellish seal
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Hellish seals (also commonly referred to as hell vaults) are a dungeon feature added in dNetHack. Being a feature of the floor, they do not block line of sight or otherwise obstruct the square. Indeed, the only way to interact with a hellish seal is to break it by digging downwards over the seal.
Hellish seals are generated as part of random level generation in random gehennom mazes. They are generated in small, closed 3x3 rooms found within larger rooms. A specific monster is sealed away within each hellish seal. The precise monster type can only be learned by breaking the seal, but the broad category can be learned by observing the statue placed on top of the seal.

Contents

1 Seal types (by indicator statue)

1.1 Strange larva: Tanninim
1.2 Ancient nupperibo: Ancient
1.3 Angel: Mad angels
1.4 Lemure: Pit Fiend
1.5 Manes: Shayateen

2 Seal treasure

Seal types (by indicator statue)
Strange larva: Tanninim
Akkabish tannin
Shalosh tannah
Nachash tannin
Khaamnun tannin
Raglayim tannin
Teraphim tannah
Sartan tannin
Ancient nupperibo: Ancient
Ancient of blessings
Ancient of vitality
Ancient of corruption
Ancient of the burning wastes
Ancient of thought
Ancient of death
Angel: Mad angels
Mad angel
Apocalypse angel
Harrower of Zariel
Jrt Netjer
Lemure: Pit Fiend
Pit fiend
Manes: Shayateen
Shayateen
Seal treasure
Each hellish seal also contains a metallic chest containing between 9 and 36 (9d4) random magical items. Approximately 1/3rd of these items will be armor, 1/3rd of them will be weapons, and the remaining 1/3rd will be random magic items. Armor and weapons may be highly enchanted, may generate as artifacts, and may generate with object properties. It will likely be necessary to dig the chest out of the ground beneath the seal. The chest is always locked and trapped.