How do you get the tentacle's in fusion fall?

To get the tentacles in fusion fall you must first get to lvl 7 by defeating Fusion Dee Dee. After becoming lvl 7 you must find a mission or an ememy that gives you a lvl7 CRATE. Inside these crates you will find a variety of things, unfortunetly the least likely thing you will find is the Tentacles (They are called Nergle Tendrells or something). Keep opening the CRATES until you find the Tentacles.