Covens/Harlie Deathstar 1850

Greetings all!
I had an idea for a potential deathstar list, and was wondering what The Dark City thinks of it.
Grotesquerie
10 man Grot squad, Abby w/scissorhand
3 man Grot squad, Abby w/scissorhand in raider
bare Haemy

Masque
Shadowseer w/HWG, MoS, ML2
6X Shadowseer w/ML2
3X Troupes, master w/HWG and Caress, all in starweavers (2 as FA slots)
bare voidweaver

Idea is get Invisibility, veil of tears, dance of shadows, and hopefully hammerhand, with priority going Invis>Dance of Shadows>Hammerhand and GoI, on the big grotsquad, with all the SS's rolling with them. The big unit runs around and punches stuff to death, while the rest of the army tries to pop any vehicles, and if there aren't any, eat some squads.

The Deathstar has a ton of fleshbane attacks at Int7, potentially S7-8 grots (depending on Hammerhand and grotesquerie bonus) and a ton of wounds.

The flaws I see with the list are its pretty low on anti-tank, and can't do anything to flyers.

The biggest weakness is it's amazingly slow and does zero outside of combat. While its packs a punch there is little in the way of AP either.

Invis across the 7 casters (14 rolls) is a pretty decent chance but I can see games where you get that plus veil and that's it. To be honest I would be going with the first seer (with mask) on phantasy then the remaining 6 go fishing

Regardless, I don't think it's a great deathstar

Could you drop the Abberation from the 3-man Grot squad and pick up a webway portal for your bare Haemy in the deathstar? That should solve some of the mobility issues slightly...

What you could do is ensure that at least one Shadowseer (or more if you get Invisibility early when you're fishing for powers) has Psychic Shriek. That way the turn you drop you can shriek something off the table with the debuff from the Mask. If you've got more than one Shadowseer shrieking then you could have some decent offensive (short)ranged output

The new FAQ means 1 shriek is the max from a unit

Really? Bummer. There goes my deathstar idea too...