Thaumic Tweaks

The mod gives control over where and how Vis Crystals appear. Options can turn crystal generation off in specific biomes and dimensions, including for particular crystal types such as Fire and Ignis Crystals, and they can raise or lower the minimum and maximum heights at which crystals spawn. A new optional model draws Vis Crystals in the world so they more closely resemble their item sprites.

Thaumic Tweaks also repairs a Research Table bug where shift-clicking a slot moved items into the player's inventory incorrectly. Thaumcraft allows some of its settings to be adjusted, and this mod covers the crystal side of that, and the author recommends disabling Thaumcraft's own generation for other ores and using CoFH World Generation instead if those are wanted. The mod requires FermiumBooter, and the server and every player need it, since the environment is client and server. Files are published for Forge only, for 1.12.2, with 1.0.2 as the latest build from 2025-05-19, and the code is released under the GNU Lesser General Public License v3.0 only, so the project is open source.