Uranium imp (UnNetHack)

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A uranium imp, i, is a type of monster that appears in in UnNetHack. It is a type of minor demon that has regeneration and infravision, and can be seen via infravision. They will pick up magical items, have a tendency to wander, and can follow a character to other levels if they are adjacent.

A uranium imp has a single claw attack, and possesses a unique ability: when hit in melee, both the imp and the attacker are teleported together to a random location on the same level, unless they are on a non-teleport level.

Chatting to a uranium imp will cause it to flee for 10–30 turns.


Randomly generated uranium imps are always created hostile.

A uranium imp will never leave a corpse upon death.


Uranium imps have a fairly damaging attack, but their primary danger lies in the reactive teleporting ability: a fight with one outside of a non-teleport level can lead to hopping all over the level, which can very easily separate adventurers from their pets and/or land an unsuspecting character in a dangerous situation. Teleport control allows control over your character's destination, but the property will be ignored 413 of the time, and the remainder of the time the imp will still appear next to you regardless of where you choose to teleport.

Fortunately, chatting to a uranium imp will reliably scare them off, allowing you to keep them at bay and dispatch them at a distance or else escape and focus on more pressing matters.


As indicated by the encyclopedia, the uranium imp originates from Homestuck, an Internet fiction webcomic series created by American author and artist Andrew Hussie and the fourth and best-known of their four MS Paint Adventures comics. The 413 chance of teleport control being ignored by the uranium imp's powers are derived from the number 413, which recurs in several aspects of the story.

The Imps of Homestuck in general are underlings of powerful beings known as Denizens and are the most common and unchallenging enemies, being described as "cannon-fodder" and displaying visible fear of higher-ranking creatures - John in particular "defeats" a group of Imps by yelling at them to leave, which is the inspiration for the effect of chatting to a uranium imp; the code has a comment that quotes the specific panel where this occurs.

When a player enters The Medium and prototypes their kernelsprite, the Imps take on the properties of that player's sprite and associated item: the Uranium Imps are based on Jade's Associated Item, Uranium, and inherit reality-warping powers from Becsprite that allow them to warp themselves and others around the Medium - this is the basis for their power to teleport attackers and ignore teleport control. Uranium Imps are also noted to be unusually tough for imps, with one effortlessly avoiding Jade's attacks by reality-warping and teleporting them both until Becsprite obliterates it, though this toughness is not reflected as much in UnNetHack.

Encyclopedia entry

Despite being imbued with reality-warping powers by the Green Sun, these trouble-making servants of darkness seem unaware of their true power, and probably would run away if yelled at.

GG: those stupid things are impossible to kill :(
TG: no you can kill them
TG: youll get better dont worry

[ Homestuck Act 5, by Andrew Hussie ]