[quote=@Cu Chulainn]
One of Rider's Noble Phantasms will be based off of Francis Drake's Golden Wild Hunt NP ([url]http://typemoon.wikia.com/wiki/Golden_Wild_Hunt[/url]), except less ship-y for obvious reasons. Dietrich was also known to have been the leader of the Wild Hunt in Germanic lore, so it may have the same rank if applicable.
[/quote]

[quote=@vancexentan]
[@Cu Chulainn]I'm not sure how you would adapt this the only thing I can think of is a small group of C class grunts appearing on horseback?
[/quote]

Well considering how the wild hunt is applied as less of ships (Drake) and more like soldiers on horseback, a better parallel would be a scaled down version of Iskander's noble phantasm. Reduce the number of soldiers (to about 12) and remove the presence of the reality marble and that seems about right. As it would involve summoning the wild hunt to effectively do what they always do. 

Go hunting.

Edit also the rank would be unable to go above A because your not summoning an armada of ships.