Description: Venom and Defense: Blue Dragons are able to ingest the stinging cells (nematocysts) of their prey and store them in their cerata for their own defense. The nematocysts are a potent venom and can cause a painful sting to humans. Beach Washes: Due to their small size and reliance on wind and currents, they can be washed ashore during storms or strong onshore winds, according to OurSC.