Welcome to Librarium Online!
Designed to be brutal, yet graceful.
Troops: 10 Dire Avengers, Bladestorm, exarch with 2 catapults, wave serpent with spirit stones, star engines, TL bright lance, shuriken cannon.
10 Dire Avengers, exarch with SS/power weapon, defender.
Elites: 10 Firedragons, exarch with pike, tankhunters, wave serpent with shurken cannon, TL brightlance, star engines and spirit stones.
10 Howling Banshees, exarch with warshout, execution, wave serpent with shuriken cannon, TL Brightlance, star engines and spirit stones.
Heavy: Fire prism with spirit stones, holofields.
Fire prism with spirit stones, holofields.
This leaves around 80 pts spare.
How about dropping the pathfinders, and adding in scorpions and a pair of vypers? It gets more more firepower and more CC potential, as well as three more mobile units, and one can still infiltrate.
Looks resonably solid, although I would recommend dropping the fire dragons down to 6 men, with no exarch. 6 melta guns at close range is more than a match for any tank, the way the squad is just now it is too many points. The effectiveness of Pathfinders have also been debated, if you must have them then split the unit into two smaller squads of five (if this is allowed, they might be 0-1) so you can try and pin as many enemy units as possible. However if some of the pathfinders and fire dragons were dropped you may have enough points for a wave serpent for the second unit of DAs.
If this helps any let me know!