The Nightmare 000

Attempting to sleep in a bed triggers a 30% chance that a Nightmare awakens rather than the player waking at dawn. Once a Nightmare spawns, it is difficult to escape: it moves faster than any other creature the author describes, strikes harder than other mobs, and kills the player in one hit regardless of the armor or gear they wear. The author gives no reliable counter and presents avoiding the summoning, which means never sleeping, as the only dependable defense.

The mod is built on GeckoLib, which must be installed on Forge for Minecraft 1.20.1 before it will run, and the author asks players to add it first. It is categorized as Cursed, with Mobs and World generation as secondary categories. Files are published for Forge only, for game version 1.20.1, and the mod runs on client and server, so the server and every player need it. The latest file is 1.0.0 for 1.20.1, published 2025-08-04, and the code is licensed as All rights reserved, so it is not open source.