Just some thought on the psyker power of Tanthus :
Fiery Flame (Shooting Phase)
A burst of flame and fire burst out from Tanthus. This attack use a template, so the profile will be : S 4, AP 3, Ignores Cover, Assault 1
Flame of Chaos (Shooting Phase)
The enemy target will be engulfed in flames. Wound will be assigned by Tanthus, not the opposing player (like Telion). Flame can only target 1 model, and will attack for S : 8 AP : 1. Flame of Chaos can't target vehicles and walkers.
Chaotic Litany of Protection (Assault Phase)
The litany that is heretical for the Imperium, but it will still protects. Due to the warp powers that is involved in this protection, all doubles on the psychic tests will result in Perils of the Warp. Tanthus and the squad he joins gets a 4+ invulnerable save this round.
Portal of Darkness (Move Phase)
Tanthus can manipulate the energies of the warp to move his troops across the battlefield. Tanthus and the squad he joins may teleport across the battlefield, with Deep Strike rule 24" from Tanthus current position. After deep striking by Portal of Darkness, Tanthus and the squad he joined can still assault the enemy. Due to the fickleness of the warp, use 3 dice instead of 2 dice when the deep strike scatters.
Roar of Chaos (Shooting Phase)
Tanthus roars by the power of the Chaos, frightening the enemy troops. The squad that is targetted by the Roar of Chaos must pass a Leadership test. If the Leadership test is failed, the enemy will fall back as usual, but may not shoot or assault in the next turn.