the Mandible Claw
The Mantis Warrior doctrine is to see but remain unseen and to attack and disappear before the enemy knows what hit them. It is a rare occasion indeed when the Mantis Warriors engage a prepared enemy head on, but when they do they hold nothing back.
In Central Texas we normally play 2000 points so it is quite easy to include an entourage of this size and power. Khan coupled with a Chaplain (normally Cassius) gives the Terminators Furious Charge and Hit and Run and reroll to hit, not to mention Kahn can instant kill... Tyranid Monstrous Creatures are a specialty.