I doubt I'll have any problems with the download, but if I do, I'll post them here. As for the cost of creatures, it's necessary to adjust the strength of the units themselves, rather than trying to "balance" this strength with the cost.Regarding "Avenger" - "Challenge" would be a better fit. "Hardened Resolve" could be a good replacement for "Forest Cunning."
If you keep the mod that affects the cost, then the priestesses should be 1/4 stronger, and the Kirins should be weakened to the level of green dragons. But this sub-mod also makes it so that Kirins require not crystals, but gems, although it's easy to change the resource in the Repository. Maybe you'll revert them to crystals in your version of the mod?