Cú Chulainn as a Master?

[Jessup2]

Does anyone know what "hero lights in one eye" would mean? According to legend, he had "Seven hero lights in one eye..."

 

https://en.wikipedia.org/wiki/Cú_Chulainn

With that Cu Chulainn flung the spear at him with its handle foremost, and it passed through his head and killed nine on the other side of him.

...three distinct heads of hair—brown at the base, blood-red in the middle, and a crown of golden yellow. This hair was settled strikingly into three coils on the cleft at the back of his head. Each long loose-flowing strand hung down in shining splendour over his shoulders, deep-gold and beautiful and fine as a thread of gold. A hundred neat red-gold curls shone darkly on his neck, and his head was covered with a hundred crimson threads matted with gems. He had four dimples in each cheek—yellow, green, crimson and blue—and seven bright pupils, eye-jewels, in each kingly eye. Each foot had seven toes and each hand seven fingers, the nails with the grip of a hawk's claw or a gryphon's clench.

 

http://www.ancientpages.com/2017/08/07/morrigan-shape-shifting-phantom-queen-meeting-irish-hero-cuchulainn/

The first warp-spasm seized Cúchulainn, and made him into a monstrous thing, hideous and shapeless, unheard of. His shanks and his joints, every knuckle and angle and organ from head to foot, shook like a tree in the flood or a reed in the stream. His body made a furious twist inside his skin, so that his feet and shins switched to the rear and his heels and calves switched to the front... On his head the temple-sinews stretched to the nape of his neck, each mighty, immense, measureless knob as big as the head of a month-old child... he sucked one eye so deep into his head that a wild crane couldn't probe it onto his cheek out of the depths of his skull; the other eye fell out along his cheek. His mouth weirdly distorted: his cheek peeled back from his jaws until the gullet appeared, his lungs and his liver flapped in his mouth and throat, his lower jaw struck the upper a lion-killing blow, and fiery flakes large as a ram's fleece reached his mouth from his throat... The hair of his head twisted like the tangle of a red thornbush stuck in a gap; if a royal apple tree with all its kingly fruit were shaken above him, scarce an apple would reach the ground but each would be spiked on a bristle of his hair as it stood up on his scalp with rage.

— Thomas Kinsella (translator), The Táin, Oxford University Press, 1969, pp. 150–153

He attacks the army and kills hundreds, building walls of corpses.

 

(Irish: Aided Con Culainn, also known as Brislech Mór Maige Muirthemne). Medb conspires with Lugaid, son of Cú Roí, Erc, son of Cairbre Nia Fer, and the sons of others Cú Chulainn had killed, to draw him out to his death. His fate is sealed by his breaking of the geasa (taboos) upon him. Cú Chulainn's geasa included a ban against eating dog meat, but in early Ireland there was a powerful general taboo against refusing hospitality, so when an old crone offers him a meal of dog meat, he has no choice to break his geis. In this way he is spiritually weakened for the fight ahead of him Lugaid has three magical spears made, and it is prophesied that a king will fall by each of them. With the first he kills Cú Chulainn's charioteer Láeg, king of chariot drivers. With the second he kills Cú Chulainn's horse, Liath Macha, king of horses. With the third he hits Cú Chulainn, mortally wounding him. Cú Chulainn ties himself to a standing stone to die on his feet, facing his enemies. This stone is traditionally identified as Clochafarmore, located near Dundalk. Due to his ferocity even when so near death, it is only when a raven lands on his shoulder that his enemies believe he is dead. Lugaid approaches and cuts off his head, but as he does so the "hero-light" burns around Cú Chulainn and his sword falls from his hand and cuts Lugaid's hand off. The light disappears only after his right hand, his sword arm, is cut from his body.

Conall Cernach had sworn that if Cú Chulainn died before him he would avenge him before sunset, and when he hears Cú Chulainn is dead he pursues Lugaid. As Lugaid has lost a hand, Conall fights him with one hand tucked into his belt, but he only beats him after his horse takes a bite out of Lugaid's side.