I don't think Urien can take a Venom by himself, only Archons and Succubi can. Either stick him with one of the Grot units, or make room in one of the Wrack Raiders/Venoms.
Might want to rethink the WWP on the two Grot units. They won't be able to charge when they come on, and they will be open to enemy gunfire.
Stick 'em in a Raider, and they can boost up 30" on turn 1, charge turn 2. Liquifiers still work because of open-topped, and they can't be shot at until they (are forced to) disembark.
Forgetting Unbound, though, your list is illegal as it is.
- Dark Artisan, fine
- Scalpel Squadron, fine
- Grotesquerie, fine
But you are using an extra HQ slot without unlocking any Detachment for it.