I think Grond should be removed as a power and given to Gothmog as an ability. Maybe the power should be replaced with something like summoning Nazguls on Fellbeasts or something like that because I think almost all the people who play as Mordor will select Gorthaur power instead because using few battering rams can do the job easily, not to mention the Trolls, Catapults, Troll Catapult and Mumakils you can use to destroy structures. Also Grond moves very slow.