Deltapack

Players who want to start the Deltarune journey in Minecraft can add the pack to a world, where it introduces dark fountains, dark worlds and a roaring knight boss. The pack is a fan creation by subzeroditto, and the author notes that it is not affiliated with Toby Fox or Deltarune and is not a precise reproduction of the original game. Its small features and the amount of content are meant as a kickstart rather than a full recreation.

A knife can be crafted and stabbed into the ground to open a dark fountain, which converts nearby items into darkner items. Spells such as snowgrave and shadow mantle are part of the well items, and snowgrave can be crafted and used to freeze nearby entities at the moment of death. The Roaring Knight is the first boss; its fight is turn based in the style of the original game, with bullet hell style attacks where the player gets the first chance to attack before the knight mimics the player's moves.

The mod runs as a data pack and is published for Fabric, Forge, NeoForge and Quilt across seven release versions, 1.21.9 – 26.2, with the 2.1 build as the latest file. The server needs the pack, while players can join without installing anything, and it is released under All rights reserved, so it is not open source.