This Mod adds:

Spoiler

1 Dimension (The Abyss) 1 Mob (Anglerfish) 11 Blocks (Pool Tiles + varients / Pool Light / Steel Block + varients / Mysterious Light) 1 Fluid (Chlorinated Water) 2 Items (Abyssal Key / Liminal Stone) 1 Armor (Diving Helmet - only head piece)

To enter the dimension:

Craft yourself a liminal stone using 1 nautilus shell and 4 prismarine shards. Find a mini liminal pool structure usually found in deserts. Find the portal room. Ignite The Abyss portal and go through it.

How to escape the dimension:

Find the hidden diving helmet. Find your way out of the liminal pools. Find an abyssal key in one of the chests on the abyss platforms. Find an escape steel block and right click it with the abyssal key. You will be teleported to the overworld spawn.