NotGuii

The Nightmare Stalker is a mod that introduces a new creature called the Nightmare Stalker. This entity is a powerful and frightening enemy that appears in caves and on the surface attacking players.

The Hollow Stalker is a shadowy entity that stalks players silently in the darkness, attacking when they least expect it.

Minecraft too peaceful...Try this and regret trying it :) (Guiishw's Song of Fear - Modpack)

Beautiful graphics, speedy performance in a simple package. 1.21.4 release!