Here are the Patch Notes for 1.25:
Balance Changes
Human
* The cost of the Ivory Tower(Buyable at Arcane Vault) changed from 30 gold and 20 wood to 50 gold and 30 wood.
* The cost of the Mechanical Critter(Buyable at Arcane Vault) changed from 50 gold to 20 gold.
Undead
*...
