@ElevationNone specified, but such is the charm of a jump-in RP. You can make up the lord yourself. If you want, you can use mines.
I had it in mind that a particular lord that Malakaus is after for personal reasons is a man named Lord Bernard Dowson, a Warhawk who wanted to petition the previous king to subjugate their neighbors for land and resources. The old king for whatever reason didn’t support Bernard’s ambitions, but Mago did. So they formed an alliance which allowed Bernard to hatch a scheme to force the orcs, of which Malakaus was a member of, from their homelands and take the mountains they inhabited. After Mago took the crown after the death of the king, Bernard continued to appeal and petition to the ursurper to solidify control over the kingdom as well as invade more territories to take for themselves.
Bernard would definitely have the money to pay for things like mercenary armies and a guild of assassins, and it’s definitely in his interest to kill Maren or else she might take away his lands since he’s been starting wars to fill his own pockets. He’s pretty much the go to guy for “rich evil person”. The fact he’s so rich is why he’s a powerful ally to Mago since Bernard can supply the new king with arms and armor for his army.
He’s currently based in the orc’s old citadel city which he’s renamed Durum, far to the north. It’s sometbing of a frontier city since the lands up north is home to a powerful empire, but the mountains themselves were considered orc lands until Bernard pushed them out. A lot of people have been moving there, especially shady people with skills that normally isn’t approved in regular society like assassination or witchcraft.