Trickster

Trickster draws its spell language from esoteric programming, and its design takes loose cues from Hex Casting. Spells are composed from patterns, items and blocks in a turing-complete, tree-like structure, so the only real limit on what a spell can do is the set of glyphs available. Progression is heavily knowledge-based: an in-game book written by an ancient arcane scholar teaches how to compose spells, and new discoveries are added to the book as notes. Looking through the creative tab or granting advancements by hand skips the intended experience.

Spells keep running alongside everything else in the world and are written to disk with the rest of the save, so a spell interrupted by logging out picks up at the point it reached. The mod limits the speed at which spells execute to keep them from straining the server. Recursion is the main way to get loop-like behaviour, and tail-call optimization lets even mutual recursion run without limit, while data moves only one node up or down the tree at a time. Accessories, CICADA, Fabric API, Lavender, Lithostitched and oωo (owo-lib) are required, and Inline is optional. Cardinal Components API is bundled inside the mod.