Erebus was glad Elsa hadn't pushed on it and he paused to think of how to answer the question. "Much like Senshi have a set amount of times they can use magic, Knights have a set amount they can use. Knight's also have a set aspect magic to add to their normal magic and it is tied to their Royal's celestial body." He purposefully left the answer vague for everything and left out things such as the fact that Page's don't get access to their magic.
It startled a laugh out of him when Elsa complained about the magical transformation sequence though. "No, we get a much simpler transformation to the envy of Senshi everywhere."
"Makes sense." He nodded. "It sounds like the buddy system works best until Dark Mirror Senshi get more powerful then?"