You send some flame spitting crabs, WOLFTOPI, and Schoolbuses filled with tank scuttlers to secure the central cavern. Seeing as all the Primpsks died in the explosion, you meet no resistance.
Some WOLFTOPI then plant some trees by the shaft, so as to help protect the shaft from future attacks, and to allow you to increase the amount of drones you can spawn.
You create some more of the biter/burrower combo, to burrow into the ground and search for other cities. Speaking of which, the first burrower has finally breached a cavern. One problem though. The burrower breached the cavern over a pool of water. Hot water. Water hot enough to keep the biters asleep, and causing them to drown. Damn it.
Also, you have infected 11% of the Primpsk city. It would have been more, if they all didn't die at the same spot. You believe that it may have something to do with a 'Brood-mother'. This does not bode well at all.
(Did the most popular idea because I took so long to get the turn up. Sorry.)
DRONES:
Advanced Scuttler: Stong, armoured, built to kill. Has incredibly fast, shrimp claws.
Scuttler: Armoured. Good all around. Shoots poison.
Gatherer: Make to collect and process DNA.
Light-bulb drone: Gives off light. Fast, but otherwise useless.
Scuttler Tank: Highly armoured. Not very fast.
Schoolbus: Carries crabs. Gives of light. Very large and heavily armoured.
Digger: Digs. Builds walls. Otherwise useless.
Primpsk drone: A Primpsk you control.
Primpsk Scout: Passively infects and scouts.
WOLFTOPUS: HALF WOLF, HALF OCTOPUS, HALF UBER-STRONG TENTACLES, HALF ARMOUR PLATING, ALL AWESOME.
Biter: Likes warmth. Hates cold. Adapted to bite onto things when it is cold.
Burrowing millipede: Digs. Biter dispenser.
Flame Scuttler: Good all around. Shoots fire.