adv. dretches need to shout fier, as well as having spider sense and spider web abilities, but we can't call them spider abilities because they are aliens and clearly not spiders. Instead we will call them SUPERFLUOUS EVASION and SUPER SEMEN STICKY GOO. The adv. dretch will also only have 1 hp but 1000 units of armor that way if you get an emp blast you can knock out all the armor but if you shoot it, it will be invincible. Also, the adv. dretch should have a subterranean burrowing capabilites to pop out like trap door spiders. And finally adv. dretches should have thermo nuclear devices attached on their backs, that way when they die it'll kill everyone on the map and end the game.