Cow1337killr is a player spoof of an adventurer that makes numerous appearances in RuneScape.
- Before the tour's removal, Cow1337killr could also be found in the Rellekka Hunter area catching Cerulean Twitches during the Gnomecopter Tours.
- He can be seen in the cutscene during the Animal Magnetism quest. He kills an Undead cow, and after being shooed away, he attempts to kill a Sneaky undead fowl during a cutscene. However, he hits a zero as the chicken dodges his attack, and deciding he'd be safer with Alice's husband, runs straight toward him.
- He also makes an appearance in the Festival of the Dead event and provides the player humorous information about his fellow player spoofs.
- He can also be seen in RuneScape's "Vote NO, RuneScape Free Trade & the Wilderness" YouTube video, with a collection of other npcs.
- He is one of the senders of medium parcels.
- He appears during Flashback in a memory of Animal Magnetism that was altered by Relomia, where he may attack Ava, the player, or some undead cows that suddenly appear.
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- "Cow1337killr" translates to "Cow elite killer" in leetspeak.
- Cow1337killr, along with other player spoofs did not receive a graphical update following Evolution of Combat.
- He wields a non-updated version of the Dharok's greataxe that has a rune colouration.