Green Wasp: The weakest Wasp. First encountered in the Wasp Menace quest, they are extremely weak and even in numbers pose little threat to the Hero. A few shots of Lightning or a couple of swings from a sword will easily dispatch them.
Red Wasp: The middle class of Wasps, this Wasp is much more deadly than the Green Wasp. Found at higher Renown levels, this Wasp can inflict massive damage in numbers but poses little threat alone.
Blue Wasp: The 2nd most deadly Wasp in the game, this one will easily drain the health of unarmoured Heroes, making them extremely deadly. They can, however, be easily dispatched by a surround spell like Enflame.
Wasp Queen: The most deadly Wasp, this is the boss of the Wasp Menace Quest. It is extremely large and has the ability to summon Green Wasps.
Despite being a higher tier, Red Wasps do significantly less damage than big Green Wasps.
The theoretical highest single hit on a wasp would be 6400 with a frying pan holding 5 Lightning Augmentations (16000 if you include Berserk 4), but it's impossible since no wasp affected by those augmentations has higher than 50 health.