From Blaseball Wiki
Offworld is a Player Modification first seen in Season β20.
When a Player with Offworld hits a foul ball, it will fly Offworld. When a foul ball flies Offworld, the Ball count is randomized.
Offworld was first mentioned on Season β20, Day 20 when Conrad Twelve gained the Offworld Sunglasses after the Chicago Firefighters won a Prize Match. However, the Offworld Sunglasses did not drop with a modification. The first Offworld item to drop with the Offworld modification was the Offworld Socks picked up from a Glitter Crate by Eugenia Bickle on Season β22, Day 7.