[Waver is quiet for some time before giving Saber an answer. He's only met one other servant here, and he's met that servant's master too. Someone would step up, clearly, but it is still a stern reminder of the various downsides of Qri's summons.

It doesn't help that Saber's question does not have an easy response either.]

It can be, or it can be kind of pointless. You don't get any instructions either, you have to figure out the rules and limits yourself. As for the other thing it's...Qri has X amount of energy, but the island itself has a lower amount which is why most magic won't manifest. Most is the keyword.