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I've tested this list at my place with a another friend of mine multiple times over so far. This list seems to be pretty efficient. I've played against Ultramarines, Necrons, Chaos Space Marines, and Deathguard. Its record as it stands are as follows...... wins 5, loses 1, ties 1. Give a look and see what you think.
War Cabal: Magnus the red.
Ahriman on a disc.
2 decked out Exalted Sorcerer's, with gift, spell familiar, one with Magnus' scrolls, and the other with Helm of the third eye.
10 Rubric Marines with their Aspiring sorcerer with a gift, with one soulreaper cannon, and an icon of flame.
2 units of 4 Scarab Occult Terminators, with 1 soulreaper cannon and a hellfyre missle rack each. (Both units are exactly the same.) Both Scarab Occult sorcerers in the units have Inferno combi-bolters and a gift.
1 Hellbrute with 1 twin-linked lascannon, and a powerfist with a combi-bolter.