Aillen

He played the harp or timpán and would lull his victims into a deep sleep with his music.

[1][2] Called "the burner",[3] According to the most frequently repeated story, Aillén harasses Cormac's court at Tara every November 1 at Samhain.

According to The Boyhood Deeds of Fionn, he would burn Tara to the ground every year at Samhain with his fiery breath after lulling all the inhabitants to sleep with his music.

[2] This only ended with the arrival of Fionn mac Cumhaill,[1] who inhaled the poison from his spear to keep himself awake and slew Aillen.

Áillen was also a popular personal name in ancient Ireland and was used by several personages.