However, Lonesome Flower wasn't stupid either. If his sister didn't like it, he would rather never use it then to let Azure Sea Breeze have it.
After they took down Baron Rivendare, the next zone became available to all of them.
In the beginning, the Highlord Alexandros Mograine and Saidan Dathrohan led their troops to attack the Stratholme ruins, fighting the Undead army head-on. In the battle, Dathrohan led his troops and was attacked by Balnazzar. While he tried his best to attack, he was easily captured by the demon and his life force was drained. The demon possessed his body and took over his identity.
He baited Renault to kill his father, which further corrupted the Crusade.
Later on, after Mograine had been slain by his son, Balnazzar led the Scarlet Crusade with its new identity to enter Stratholme again. He then fought against the Scourge army for years and through this war, selected his best men for the next step of his evil plans.