Driller Blitzers are a hybrid between a Tank and a Hunter. Strong as a Tank and fast as a Hunter is a fairly dangerous combination. Combined with a Pit to take cover in, these like fast abominations and very difficult to dispatch from range when in numbers.Finishing these off means finishing the entirety of the Zombicide Invader Kickstarter plus a few extras - including a second set of Blitzers to give a total of 12. Just having 6 of them would require removing some of the spawn cards or facing an increase in Abomination rush-related deaths which are no fun at all. Doubling the number should allow for at least a couple groups of these beasts on the board at once before running out.