Your generators, Elemental Arrow, Chakram, Impale, Multishot, and Cluster Arrow deal 100% increased damage for every active Sentry.
"I envelop myself in the trappings of my foes, and I learn their ways. I will master their wickedness and purge it. I can bathe in the foul darkness of their kind and emerge clean, for I am purified by my vengeance."—Hunter Kee Morse