Slenderman: Ascend

Slenderman appears only under certain spawning conditions, and the author sets those conditions in the mod. Some mobs spawn only above Y level 60, others only below it, and most spawn in the overworld and not in other dimensions. Players who want a different mix can change those rules in the data, since spawning conditions decide when a mob appears at all.

Players collect pages scattered through the world, eight in total, and the page counter restarts when Slenderman kills a player after eight pages have been gathered. The gamerule slenderPageCounter can set the count to zero or eight instead. Pages are found in Slenderman structures placed in Dark Oak Forests and Taiga biomes, and they can also drop when the mob dies.

The mod requires Geckolib on Forge. The server and every player need the mod installed. Files are published for Forge only, for 1.19.2, 1.19.4 and 1.20.1, with 1.0.0 for 1.20.1 as the latest file. The author built the mod with MCreator, and the author recommends the newest versions, where structure generation and custom villagers are improved.