Enter Sandworm

Sandworms appear in desert biomes of the overworld and, through a config option, in soul sand valleys of the Nether. Each worm can eat a player instantly if it collides with the head. Its body also deals damage when a player touches it, and the worm's health and bite damage are both set by the mod. A soul sandworm can be triggered when a player digs out a soul sand block, and a desert worm can reappear twice within 90 seconds of a previous one. The mod is server-side configurable, so server owners choose whether sandworms spawn in soul sand valleys and deserts.

Blowing up the head with explosives is named by the author as the most effective way to kill a sandworm. Dropping a tooth on death gives players a material for crafting the Crysknife, a sword stronger than the netherite sword. Enter Sandworm runs on Fabric, Forge and NeoForge for 1.21 – 1.21.1 and requires Cloth Config API, Forgified Fabric API and Sinytra Connector. Mod Menu is optional and gives easier access to the config screen. The code is public for inspection, but the mod is not open source and is released under All rights reserved.