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Geyser is a monster spell in NetHack that is used by the strongest clerical spell casters.


Geyser can be used by any monster that can cast clerical spells and is at least level 14.[1] When cast, the spell causes a geyser to slam into the player character for 8d6 damage, which is halved rounded up if they possess half physical damage.[2] Monsters at level 15 or higher have a lower chance of casting the spell, and may use open wounds instead.[3]

The following information pertains to an upcoming version (3.7.0). If this version is now released, please verify that it is still accurate, then update the page to incorporate this information.

In commit 6b8079a1, the groundwork is laid for the geyser spell to potentially cause water damage to items in the inventory and on your square.


A sudden geyser slams into you from nowhere!
You were hit by the geyser spell.[4]



In EvilHack, clerical spellcasting monsters can use the geyser monster spell at level 13, and the spell can be used against other monsters. It also gains the ability to rust armor, and instantly returns you to normal form if you are hit while polymorphed into an iron golem.

Kathryn the Ice Queen, Asmodeus and Vecna can cast a variation of this spell that deals 8d8 cold damage, which is also subject to half physical damage and can destroy potions in the target's open inventory.


An avalanche of ice and snow slams into you from nowhere!
The icy variant of the geyser spell was cast at you.