Their Psyche Shields weren't strong enough to affect the Lorcar, due to the massive amount of Psyker energy from the Lorcar fleet. A few frigates and corvette's worth of Anti-Psyche shields wouldn't even be felt by the Lorcar at their home, thats how powerful they were. To send these wasn't a attack...It was just foolish. They saw that the opponent attacked them, and wasted no time with pleasantries such as warnings, not even allowing the enemies into their solar system. Those missiles were crushed like tin cans with Psychic power, and not even the virus could escape them, thats how precise they were about the attack. These and the enemy ships were also sent away with a telekinetic pulse strong enough to flatten them at the same time. Finally, with the foe far out of their solar system, they uses their telekinetic abilities to force these all upon each other, crushing them into a small, frigate-sized sphere, condensing everything to large pressures before then using pyrokinesis to heat up its insides, melting it into a small boiling ball of liquid metal. Anything organic within it would be seared away into oblivion, and nothing had been allowed to escape. Even if it had...The cold of space is a harsh and inhospitable place for something like that to survive. The Lorcar Bioships had enclosed ecosystems within them, and a small atmosphere, allowing them to stay alive. These? Anything within that had no such thing to protect it. They'd have no chance of survival.