Xenotech Set - Murder Mystery 2

Includes the knife and gun.

"The Xenotech Bundle is a gamepass introduced in the game on the 18th October, 2025 by Nikilis for the Halloween Event 2025. It was purchasable for 3,399 Robux, and contained the godly weapons Xenoknife and Xenoshot along with a special effect Xeno."

~MM2 Wiki

Disclaimer: Xeno weapon effect not included since effects are non-tradeable.