Description:

Veinshifter Ore is a placeable block that immediately converts into a random vanilla ore when placed (using deepslate variants below Y=0) and also generates naturally in massive overworld veins of configurable size, with touching Veinshifter blocks converting to the same ore to form consistent veins; note the block is not available in creative inventory or crafting by default but still appears in worldgen. Behavior is controlled by a JSON config in your Fabric config folder (global across worlds) where you can toggle conversion on or off, enable bedrock veins and set their chance, and set min/max vein sizes and the maximum connected conversion size so you can make much larger veins or limit conversion spread.