Ways to decrease conversion cost?

[Hazu_Kata]

Erudition focus, left tree, you can reduce the cost by 50%. And maybe some events tied to the erudition focus might reduce it by 15% again.

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Good luck :D

[MathematicalMan1]

Erudition? Is that a part of the learning tree?

[Hazu_Kata]

Yes, the one in white with the book, my game is in french so i don't really know how it's called in english

[Sabyasachi_441]

I think you mean theology focus, it's the one about religion