POE Potent Chaotic Resonator is a socketable currency needed for crafting rare items. It puts a random mod on a rare item. In order to have the influence, it should be filled with fossils. Potent Chaotic Resonator has only 2 sockets, hence requires 2 fossils. A player may not take fossils back after all sockets of the resonator are filled. There is an opportunity to buy Potent Chaotic Resonator from Niko or other players of Path of Exile game. You can also purchase the item at the best price here.