Alpha Castor, Beta Pollux

is the second Noble Phantasm of Dioscuri.Fate/Grand Order material X - Dioscuri profile translated by Justicar Jyggalag at Reddit
The Dioscuri's armaments are Noble Phantasms in and of themselves, radiant starlight being turned into a shield and sword respectively.
The shield has a Conceptual Defense effect when its True Name is released, but that is fundamentally not used in “FGO”.
==References==
Category:Noble Phantasms
Category:B rank Noble Phantasms
Category:Anti-Unit Noble Phantasms
Category:Armor
Category:Swords
Category:Conceptual Noble Phantasms
Category:Noble Phantasms introduced in Fate/Grand Order
Category:Noble Phantasms of the Argonauts