Vein Creepers
Adds configurable ore based Creeper variants such as Diamond creepers, two recipe types and a trap block to transform mobs
⬇ Download on CurseForgeAdds a bunch of extra creeper variants using a config file and two recipe types
When they explode, if nearby Stone blocks are around (configurable), then these blocks are infused with ores
First lay a trap
Then set items in your trap
After the trap converts the creeper, let it explode around certain blocks such as plain old stone to convert them into ore blocks
See example config and both types of JSON recipes HERE

Another example: lapis creeper explosion
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Built on FORGE and FLIB https://www.curseforge.com/minecraft/mc-mods/flib
To customize this for a modpack, create a vanilla Datapack, and/or use https://www.curseforge.com/minecraft/mc-mods/crafttweaker See examples here https://github.com/Lothrazar/VeinCreeper/tree/trunk/1.20/examples
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Vein Creepers is a free Minecraft Java mod. Compatible with Minecraft 1.21.1, 1.20.1. Downloaded 1,114,268 times (via CurseForge). Download it and open it directly in the game.