The Shok Taan Strike Cruiser incorporates the new energy dampening developed by the Breen since the construction of the Ghor Taan Battlecruiser.
Whereas the Ghor Taan was designed as a multi-purpose cruiser, the Shok Taan Strike Cruiser is instead designed for the rapid disabling of enemy starships. The Shok Taan's burst beam weaponry allow the ship to strip the enemy of their shields while its photon torpedoes explode upon the hull.
The cost of converting Ghor Taans to Shok Taans is high and the Breen have only been able to convert a portion of the hulls over to the new standard.