Excalibur
Holy Sword+20 and upFinal form

Excalibur

A Holy Sword shows this form while its highest grade is +20 and up. It is the family's final form; forging can carry on up to +99 without changing the look.

Before and after

Sword of the Promised DawnSword of the Promised Dawn+18 to +19ExcaliburExcalibur+20 and up
Final form

See every Holy Sword form on the Holy Swords page or the whole evolution tree.