Gegeines

Gegienes are the Greek name for Earthborn. They have six arms each, and wear nothing but leather loincloths(so far).

The Lost Hero
Once Jason, Piper, and Leo got to Mount Diablo, they met Enceladus, who summoned Earthborn straight from the ground. Leo destroyed five of them with construction equipment, and the last one destroyed by Piper. Once they got killed, they left some pieces of loincloth behind.

After Jason, Leo, and Piper got their Bell 412 helicopter destroyed, Thalia met up with them. She told them about how they were surrounded now, and then killed one of the Earthborn with her final arrow. Later, Piper and Leo fought the rest of them, and returned all of their essencess to Tartarus. Unfortunately, after Porphyrion rose, they came back to life.