Found the Mantis Cruiser

[ApharmdKN]

http://imgur.com/a/V2XgF

Found it on the Mantis homeworlds sector, the Mantis Pheromones augmentation increases movement speed by 25%. It has no sensors subsystem by default.

To get the ship when I first warped in it came up with a screen identifying the pirate pressed 1. to continue then attacked the ship.

Got it down to 1 bar life then teleported 2 mantis to wipe out the crew. After the last crew member fell an option to take the ship captain to the medbay (Advanced medbay option in blue), I had it fully upgraded.

Then an option to have a mantis crew member convince the pirate to join us (blue option), then a screen showing that the ship had been added to the hangar, a stealth weapon augmentation, bomb weapon and a quest to what I assume was his hidden cache.

A fully upgraded medbay seems to be the deciding factor.

[VladePsyker]

I did this mission with 1 mantis, rank2 med bay and rank 2 teleport

you need only kill the crew on the ship to win