As they neared the Earth's surface, Kerberos tossed his three heads because he hated the sunlight. His spit flew in all directions. From that spit grew the poisonous plant, aconite. When Heracles arrived in Tiryns, Eurystheus was performing a sacrifice. The king gave the best cuts of meat to his relatives and only a slave's portion of meat to Herakles. Herakles was furious with this insult and killed Eurystheus' three sons. Eurystheus was terrified when presented with Kerberos and hid in his bronze jar. Herakles took Kerberos back to the Underworld. Another account says the monster escaped. This Labor is the twelfth and last Labor in some accounts.