well, this is my reply for your statement at mgeterno11's thread
i see that you've misunderstand
the forsaken is undead, but they fight for their self, not ordered by anyone, dreadlord (the one who kill lord garithos) is one of the forsaken, why?
this is the fact, the dread lords can kill anyone they want, but they forbidden to kill each other, and this dread lord has violate that rule (i think it's an ancient rule), so he's counted as a forsaken
in the other hand
Arthas menethil Did not Betray the undead, it is their plan