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Cancerous Rodent

Cancerous Rodent

Who's our friendly rodent pal who lives in Reactor 3? C-A-N-C-E-R M-O-U-S-E!
Whose irradiated fur is slowly killing me? C-A-N-C-E-R M-O-U-S-E!
Cancer Mouuuuse~

Absolutely harmless creature that deserves nothing but death. At least, that's what it WANTS you to think.

Cancerous Rodent is a secret "boss" enemy that appears in the mission [ 1-2: THE BURNING WORLD ]. It can be accessed by breaking a cracked wall in the lava room that contains a Soul Orb. Afterward, another cracked wall must be broken to access the Cancerous Rodent's arena. Cancerous Rodent is a reference to popular boomer shooter YouTuber Civvie11, who has a reoccurring character named Cancer Mouse that claims to be a children's entertainer but is actually an alt-right political pundit.

Appearance/Details
Cancerous Rodent is a collection of roughly 15 polygons vaguely arranged in the shape of a mouse. It is found at the end of a tunnel that is modeled after what is shown in the Civvie's Dungeon intro with the arena taking place in Civvie's Dungeon Cell. It slowly moves towards V1. It is the weakest enemy in the game, with the lowest health and no attacks. Despite the Rodent being incredibly weak, it is a herald of what's to come, as killing it and moving back out of the Dungeon will pit you against the Very Cancerous Rodent, a boss that poses some amount of a threat to V1.

Rending Apart
While the Cancerous Rodent is a very intimidating foe, it can easily be dispatched with a well placed hitscan attack. Just be sure not to use coins. Ground slamming also works, though, it can take a couple tries. Using the Attractor Nailgun is recommended, but bringing the Cancerous Rodent to the trap will take some time.

You don't have to worry about the Cancerous Rodent's attacks, because V1 is immune to cancer via being a machine.

(This description is copy+pasted from the ultrakill wiki)