Melworks

It is the main feature of the Carry On mod, but server-side only: you can carry mobs and place them down

Disguise any entity as mobs, players, or blocks visuals only, behavior stays.

A lightweight villager brain overhaul that makes villagers feel more alive and responsive.

Fabric mod for slow, subtle creepy ambience in Minecraft. Highly configurable.

Immortal Snail is a Fabric mod that spawns a single unkillable snail that always paths toward the nearest living player. It is invulnerable, can cross water and lava, and with mob griefing on it slowly breaks block

Adds troll commands to mess with your friends

Give individual players mob protection, keep inventory on death, and instant respawn with simple commands.

Happy Ghast+ improves tamed Happy Ghasts on the server with a more compact size, fire resistance, and more reliable riding/menu behavior. Java players can join without installing any client-side mods, since all features run server-side.