I have to seriously question the undead status of this mob. Invis vs undead doesn't work. It doesn't even produce the message that they see through it. Meanwhile, Perfected Invisibility does produce the message that they see through it. And, finally, Worlu's Windcloak DOES render you invisible - and with just enough time to run to the quest mob in the last room. Hopefully, you have a way out (i.e. Gate).
I have to seriously question the undead status of this mob. Invis vs undead doesn't work. It doesn't even produce the message that they see through it. Meanwhile, Perfected Invisibility does produce the message that they see through it. And, finally, Worlu's Windcloak DOES render you invisible - and with just enough time to run to the quest mob in the last room. Hopefully, you have a way out (i.e. Gate).