Gost riders

[Cainehill]

Yep. But unlike Ghost Riders, that spell won't destroy armies - it's more along the lines of Call of the Wild / Call of the Winds, useful for taking weakly defended provinces.

[Agrajag]

Army of Dead or Army of The Dead, an Enchantment spell.
Its a fun spell if you need to get some utility forces to a faraway province (such as pillaging a newly acquired province without having to keep its conquerors in the province).