Mielon's The Sift + Yazz's Dungeons: The Sequel — experimental compatibility datapack
Minecraft Java 1.20.1 / Forge

WHAT THIS PATCH DOES
- Keeps Yazz's large ancient-city arena as the root structure.
- Inserts one of Mielon's three city-center portal/puzzle variants into the arena at the city-anchor X/Z position.
- Keeps the three Sift variants selectable at random while every selected template still includes Yazz's arena.
- Replaces the four inner Sift jigsaw connectors with their final blocks so they do not start extra city-wall pieces from inside the inserted room.

INSTALL
1. BACK UP THE WORLD FIRST. This only affects ancient cities generated after the datapack is enabled; it does not remodel already-generated cities.
2. Put this ZIP in <world folder>/datapacks/ (leave it zipped).
3. Load the world and run /reload, or enable it while creating a new test world.
4. Test in a NEW world or a location with a not-yet-generated ancient city.

IMPORTANT
This is an experimental structural merge inferred from the two uploaded JARs. The structure has been NBT-validated, but it has not been tested inside a live Minecraft client. The inserted Sift center occupies an 18x31x41 block volume inside Yazz's 85x34x71 arena, so it deliberately replaces that part of the arena rather than preserving every arena block at those exact coordinates. Please test in a copy of the world before using it in the main save.
