As an Undead can I do any quest like Subdue the Subduer? Touch of the Grave will proc as I am channeling the Soul Cannon. I am unable to complete the quest.
You can try to do it naked with rez sickness. (Which is much harder now that the debuff is only one minute.)
You can also try the Whole Body Shrinka toy, just make sure you’re at him when you use it. It significantly nerfs your movement speed along with your damage so you it’s best to already be right on top of him when you use it.
Just in case someone comes looking for a solution like I did; I stood near the portal as someone else attempted and got credit. We weren’t grouped or anything that should have allowed me to get credit, but as soon as he walked through the portal, it completed that step.