From publisher blurb:
Though seemingly insignificant, the sheer abundant life-force of spiders, flies, centipedes and their ilk has attracted the patronage of many powerful gods. The earliest warlocks learned these Vermin Lords granted boons not just upon their subjects, but also on anyone willing to forge a pact with them.
These warlocks can call upon the powers of arachnid, worm and insect to poison foes, sicken them with pestilence, and consume their very flesh.
This pact features a full listing of powers from Levels 1 through 30, a new Feat exclusive to the pact, a paragon path, and three new magic items.