Etarcomol (Person)

Could flesh this character out a bit more
Etarconol is a character from the Ulster Cycle in Irish folklore. He is the son of Eda and Léthrenn and a foster-son of Ailill and Medb. He was the first champion to face Cú Chulainn in single combat. He was killed as Cúchulainn struck down through his crown and split him "to the navel".
[Cu Chulainn] shows his adeptness with [his sword] when he cuts down a forked branch with a single stroke, confounding and impeding the enemy greatly in TBC I (ll.330-72). In addition, he removes Etarcomal’s clothing and hair with it, without scratching his skin (TBC I, ll.1353-9). He captures the birds in Serglige Con Culainn with a táithbéim ‘returnstroke’ from his sword (Dillon, 1953a, 2, §6).