Beagalltach

is one of the armaments gifted to Diarmuid Ua Duibhne by the Sea God Manannán. It takes the form of a short sword. Diarmuid uses this sword not as his main weapon, but as his sub-weapon. It is a defensive Noble Phantasm that increases Diarmuid’s defensive power, and his overall combat performance when he handles it alongside his first Noble Phantasm – the magic sword Moralltach.
When danger was scarce, Diarmuid would carry Beagalltach along with the demonic spear Gáe Buidhe.Fate/Grand Order - Profile of Diarmuid Ua Duibhne (Saber), translated by Kinalvin on Reddit
This Noble Phantasm is the reason for why Diarmuid's Magic Resistance ranked up from B Rank to A+ Rank.
In Fate/Grand Order, it is treated as a Skill in gameplay.
==Gallery==
Móralltach and Beagalltach (CE 894).png|Móralltach and Beagalltach in Fate/Grand Order, illustrated by Haruka Kamikokuryo.
==References==
Category:Noble Phantasms
Category:Anti-Unit Noble Phantasms
Category:B+ rank Noble Phantasms
Category:Swords
Category:Noble Phantasms introduced in Fate/Grand Order
Category:Noble Phantasms of Diarmuid Ua Duibhne
Category:Noble Phantasms of Manannán mac Lir