Slider

The Slider is a boss that is thought to have been released along with the game.

Appearance
The Slider looks like an enlarged Green Runner with spawners on the sides and a trap launcher in the back.

Technical
Not much is known about it since it is so rare... though we can tell you the (estimated by Purrfect Speed) odds of finding one: 0.5% (if searching for a week).

"Strategy"
Honestly, I think this boss is so rare that it's considered upright cruel to kill one... if you're lucky enough to see it. So, a recommendation would be to use Incognito to stalk the Slider until you gtg, it dies, or the server restarts. Also, if you are fortunate enough to find one, take pictures in a spam spree (take a lot of photos, and fast). If you can, maybe even take a short video.

Strategy Sum Up
Unknown

Orgins
The boss idea of the Slider originated in a FANON "parody" of diep.io that went by the Tale of Diep.

In woomy
The Slider's history in woomy.arras.io is currently unknown.

Trivia

 * This is probably the rarest boss in the game. We don't even have any pictures of it except for the Inkscape image!
 * Why is it so rare??

"Gallery"
If you see it, add every picture you took here and please let me know. We need more evidence that this boss exists, by the way!