I think you mean 50% of the cost of clearing debris - those rocks & trees that grow, not the actual forest, that they 'balanced' by giving changing 10% discount to 10% cashback.
Blacksmith research you have to do - heavy cav become tanks eventually.
But the Animal Blessing is practically obsolete now - but the Library Research is for 50% increase in all timed blessings, works for Training too (a temporary situation no doubt)