Sculk Horde: Physarum

Once a player joins the Sculk Horde side through the addon, normal food is rejected, and health regeneration and ability casting draw directly from the experience bar as XP Essence. Horde Support Units recognize a vanguard and apply buffs tied to its abilities, while Sculk Sensors stop reacting to the player's presence, giving near-perfect stealth against the Warden. Acoustic Camouflage and Horde Synergy are listed among the side's systems.

The mod's other mechanics are more hostile: holding Shift and right-clicking an infected mob breaks it down into base components and items through Biomass Recycling, Corrosive Flesh erodes ordinary tools quickly so a standard shield barely survives a hit, and Purifier's Wrath applies debilitating effects to Purifiers. Players can also ride Sculk Phantoms. The mod is server-side only, so players join without installing it, and it is published for Forge 1.20.1 only, with 2.1.5 as the latest file, under All rights reserved and not open source.

Physarum needs the Sculk Horde mod, which it extends, so the base mod must be installed on the server as well. Sculk Horde must be present on the server for the addon to load.