Modpack version:
2.6.0

Description:
When craftin the biothaumic mind a rune of earth is used. However you can't use the rune of earth if its from botania. It has to be the rune of earth from contenttweaker. I don't think/know of a way to swap the mod it is from, but without the contenttweaker variant the crafting won't even start

Steps to reproduce:
Set up a thaumic fusion altar with 4 pedestals / place 2 brains, 1 complex arcane mechasnism and a rune of earth on the pedestals / place a clockwork mind on the pedestal in the middle / place down warden jars with the correct essentia (cognitio, machina, herba, bestia) / try to start the fusion crafting with the caster's guantlet

i think i got it from mortum yes. Since im still in 2.6 that would probally explain why

You have to use ContentTweaker runes for everything. How did you get the Botania Earth Rune? Was it from Mortum? Because I fixed the Mortum loot table in 2.7.0.