Would it be possible to get a bigger stat increase for this option? I feel for me personally, early game is really tough for low level non-offensive characters such as a merchant since you can't use your hero to defend or he'll be cleaved into oblivion.
As it stands right now, the option seems to only increase the HP of the tower by about 500~ which isn't much considering the global stat changes and some units being super strong. I do find myself favouring non-physical attack types way more, especially the fey as usually it's 1 hit kill regardless of the enemy.