I agree it should be source free, especially when most of the challenging enemies' blood alone from just KILLING them will revert the ground back to cursed. It's too weak when compared with how many avenues the enemy has to undo the bless. We don't have any "holy" blood to counter it so it just comes as not worth wasting source. This is a shame because in EA promotion they really pushed how blessing and cursing the battlefield would be a big part of the game but it's just economical for us to use it,
