[quote=@Bright_Ops]
<Snipped quote by BBeast>

It's not so much that the Undead exist, it's more the fact that most of Vestec's contributions are... quite effectively little more then mindless weapons that go on rampages or worse, are intelligent enough to forcefully control other undead. A better way to word it would be... Farxus is the God of the Damned and the Cursed and will do what he can for them... but a part of him has a grudge against those who made the curses in the first place.

Edit: Also, while Farxus is the God of Undeath... he is still first and foremost connected to the Domain of Death and the lengths that Vestec has gone to defile it is a fundamental insult to him and everything he stands for.
[/quote]

The Cursed are basically the cursed from Dark Souls (minus the GO INSANE IN THE END bit. For some of them at any rate. Some do lose their minds and start eating everything within sight). Ugly and hated, but still sentient. 

Reathos was planning on making them mindless to balance. Then. Well. Vestec killed him. IN SELF DEFENSE.