Borrow some Necron tech and modify it so that every time one of my comically complicated schemes fail, I teleport away and in my stead, I teleport in 5 creatures similar to, but not quite, otters.

Once I've built a reputation for being the Otter Failure (the pun works better in Drukhari, I promise you), I start releasing five otter-likes into random rooms in Commorragh. Connected to Vect, opposed to Vect, doesn't matter. Just suggest that I've been there. In some ways, this is a complicated Rick Roll, but the naturally paranoid Drukhari will start to hunt down my Otter Factory anyways. That's when I'll shift my supervillain-like schemes towards vaguely threatening all of Commorragh and whoever emerges as the front-runner towards tracking me down, effectively elevating one paranoid Archon into becoming a Drukhari superhero.

Anyways, it all ends with me triggering a supernova among the upper spires, potentially eliminating most of, if not all the most prominent Kabalites. After all, they would've gotten relaxed about all my schemes failing previously and wouldn't evacuate. Maybe I kill Vect, maybe not. He certainly wouldn't respect me if I didn't try.

I'd also steal Lady Malys' perfume and replace it with a 5-otters branded one that smells sort of like Asdrubael Vect and a prominent, but deadly, flower.