Trivia: How do you kill this unit?

[sector24]

I'm fighting MA C'tis, and I have his capital under siege with the walls down. Inside is an Astral 9 Nature 8 Sphinx. He scripts Body Ethereal, Luck, Curse, Curse, Curse, and the AI spams paralyze over and over again.

The Sphinx has about 600 hit points with no dominion, and he just ruins everything I send at it. I currently don't have any units that can deal 600 damage before he paralyzes them. So what's the best way to kill this guy?

My current plan is to just take all his other territories and dominion kill him, but there must be a faster way...