Cruaidín Sétanta

is the Noble Phantasm of Sétanta.
A Noble Phantasm where the unnamed sword awarded to Sétanta by - at the time when he was recognized as a warrior of Ulster - is assimilated with Cruaidín, the sword of light that appeared in the legend of “The Battle of Ross na Rig”.
A magic sword that emits a faint light. At the time of its True Name Release, it strongly radiates light, demonstrating a power that is even akin to the magic sword Caladbolg that his foster father Fergus wields. Making use of the fearsome combat techniques he studied from his teacher Scáthach, Sétanta beats up his target to a complete pulp.
At the time of establishing this Saint Graph with his True Name as Sétanta for this summoning, it is thought that the two swords were assimilated into one Noble Phantasm because of the shared trait where each sword was wielded by Sétanta - namely, the hero Cú Chulainn - during the times of battle.
“This sword, isn’t it actually the one I used later on? Isn’t that unfair?”
“Well, lots of guys have unfair Noble Phantasms anyway, so whatever!” Such was told by Sétanta.Sétanta profile - translated by KinalvinFate/Grand Order Arcade material - Sétanta, translated on Reddit by Radiant-Hope-469
==References==
Category:Noble Phantasms
Category:Swords
Category:Anti-Unit Noble Phantasms
Category:B+ rank Noble Phantasms
Category:Noble Phantasms of Cu Chulainn
Category:Noble Phantasms introduced in Fate/Grand Order