Thanatos

The Greek personification of death who dwells in the lower world. In the Iliad he appears as the twin brother of Hypnos ("sleep"). Both brothers had little to no meaning in the cults. Hesiod makes these two spirits the sons of Nyx, but mentions no father. 

Thanatos was portrayed as a youngster with a inversed torch in one hand and a wreath or butterfly in the other. He appears, with Hypnos, several times on Attican funerary vases, so-called lekythen. On a sculpted column in the Temple of Artemis at Ephese (4th century BCE) Thanatos is shown with two large wings and a sword attached to his girdle. 

Thanatos is also linked to Artemis as her executioner. Though there are some who say this Thanatos is different from the Greek god. It is believed that her executioner is a former Daimon, but no one other than Artemis knows for sure.