Halberd: This form shares part of its design with Rhongomyniad. This one has the highest speed and sharpness. Using this one reminds Gray the most of her trance-like state when using Rhongomyniad, so she doesn't like it very much.
Greatsword: A form rarely taken by Add. An imitation of Excalibur. To begin with there's no real reason to have Rhongomyniad imitate Excalibur, but this form was something set up by the Arthur cultists from Gray's hometown.
Fate/Grand Order Materials VIII, Gray