Adunatos

Adunatos is a legendary sword which belonged to King Acmonides and was said to possess divine powers as it was as ancient as the Gods. According to myth, the king used this weapon to behead his son Adrinissos - the later god Erigonio - when he discovered the affair between him and his wife, the goddess Phoeraia. While Adrinissos was later revived by Cirta, the goddess was unable to attach his severed head back, saying "I can bring back life back into Adrinissos, but no art can bring together what Adunatos has cut".
The Three Curved Swords of Tauromenion, consecrated to Phoeraia, are said to been forged to resemble the mythical Adunatos.