Why aren't you considering Rhyas with Primal Terrors? Either instead of our in addition to Thagrosh.
Berserk with her feat is hilarious. Ogrun love the speed boost. Warspears love Occultation. Rhyas loves the Blightbringer and all the medium bases to hide behind and charge through. Even the Hellmouths benefit a lot (the extra attack on the tentacles and the placement can really help their accuracy)
This list basically wrote itself:
War Room Army
Legion of Everblight - rhyas primal Terrors
Theme: Primal Terrors
3 / 3 Free Cards 75 / 75 Army
Rhyas, Sigil of Everblight - WB: +30
- Ammok the Truthbearer - PC: 4
- Blightbringer - PC: 32 (Battlegroup Points Used: 30)
- Harrier - PC: 3
Warmonger War Chief - PC: 5
Blighted Ogrun Warspears - Leader & 4 Grunts: 15
- Warspear Chieftain - PC: 5
Blighted Ogrun Warmongers - Leader & 4 Grunts: 13
- Gorag Rotteneye - PC: 0
Blighted Rotwings - Leader & 5 Grunts: 7
Hellmouth - Hellmouth & 3 Tentacles: 0
Hellmouth - Hellmouth & 3 Tentacles: 0
Farrow Valkyries - Leader & 2 Grunts: 8
Blighted Ogrun Warmongers - Leader & 4 Grunts: 13
THEME: Primal Terrors
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GENERATED : 05/24/2018 11:28:28
BUILD ID : 2066.18-05-11