 Hearing this, Gaia sought for a certain plant ("pharmakon") that would protect the Giants.Before Gaia or anyone else could find this plant, Zeus forbade Eos (Dawn), Selene (Moon) and Helios (Sun) to shine, harvested all of the plant himself and then he had Athena summon Heracles.According to Apollodorus, Alcyoneus and Porphyrion were the two strongest Giants.