Curse of the Abyss

The mod turns the deep underground into a hazardous zone called the Abyss, which begins near y -64 and is marked by a field that grows stronger with depth. The effects are split into seven layers. The first layers bring dizziness, nausea, exhaustion, hunger and thirst, while deeper layers add numbness, headaches, hallucinations, bleeding, loss of the senses and, in the seventh layer, instant death.

The mod is meant to make the depths of the world feel more foreboding than vanilla caves, and its author describes its purpose as recreating a sense of decompression in the underground. It also adds chest minecarts for players who want to explore the Abyss with supplies. The config controls how the visual effects appear, and a seizure warning is shown because some effects can flash depending on that setup. It requires Forge and is published for 1.20.1, with files also listed for 1.18.2 under the 1.18.2 – 1.20.1 range.

Curse of the Abyss is open source under the CC0 1.0 Universal license and runs on client and server, so the server and every player need it. Curios API, Sanity: Descent Into Madness and Thirst Was Taken are optional dependencies that extend the mod when installed.