[Well, it was quite a bit to take in. Ilya's not too surprised that she might need to consider it for a bit. As the silence drags on, she starts wondering just how different her own version of magic is from Xion's.

Before she can ask, though, her thoughts are interrupted by that sigh, and Xion's question. She ponders a bit over which reason to give her.]

Because I summoned Berserker. They're much harder to control than your average servant, so I had to have extra time to make sure our bond was unshakeable.

[That's a very, very tiny part of the whole truth, but Ilya sees no reason to tell Xion about the sort of things her family tended to do to her in the name of "training".]