There were originally seven Commanding level extraterrestrial visitors here.
Every time Baldwin thought about being defeated by these seven, he felt immense anger. He hadn't killed a single one of them, only some of their troops, and the Empire's cavalry had suffered heavy losses.
When he returned with his troops, he found that the vampire Lord was already dead.
But the other extraterrestrial visitor Lords could bring troops over, meaning they weren't too far away. Except for the undead flying from the snowy mountain, none of the elemental troops could outpace the Empire's cavalry.
Moreover, the extraterrestrial visitors weren't friends; they were competitors.
The snowy mountain was treacherous, and the undead Lord was powerful. Baldwin decided not to send troops to search for the undead Lord yet. His primary targets were the others.