Create: Towed

A tether starts with a Rope Coupling held in the hand. Right-clicking a valid block, such as a Rope Connector or a Rope Winch, sets the first end, and a preview line shows the pending link. A second right-click on a leashable mob completes it. Shift plus right-click while holding the Rope Coupling cancels a pending link before it is finished.

Once connected, the rope becomes a simulated physics object. It hangs under gravity and follows both endpoints in real time, so a contraption can drag or tow the creature along. Rope Winches extend and retract the rope actively, which sets how far a tethered creature may wander. If either end is lost, through a broken block or a dead entity, the link is severed and the Rope Coupling drops at the midpoint.

Towed is a NeoForge mod for 1.21.1, released under the MIT License as open source. It is published for NeoForge and runs on client and server, so the server and every player need it. Its server settings are saved in a file named towed-server.toml. The mod is in early development, and its alpha builds are not meant for regular play, so a backup of the world is advised before installing it.