So it basically just requires RM and IP, or is something else supposed to be on the other side of the 'one of?'

Karazhil says, "The Fortress of Ice spell creates a tall ring of impenetrable ice walls which isolate the caster and those closest to him. Though the walls cannot be scaled from outside, footholds on the inside allow escape. Before you can learn this spell, you must know Rising Mists. Additionally, you must know one of Ice Patch and Ice Patch.

... and another: aegis of granite req has a blank.

Karazhil says, "Discovered in an ancient cave by Dwarven Warrior Mages, the Aegis of Granite spell ... Before you can learn this spell, you must know and Aether Cloak