The performers might well have been summoning spirits in a mysterious ritual.

I could show you how to summon and control spirits.

Not only a military strategist, she is also an Onmyōji who can summon spirits.

Not that it couldn't summon spirits under the right circumstances.

Wouldn't he have to be able to do magic in order to summon spirits?

It was said that he could make himself invisible and summon spirits from the dead.

He said it was used to summon evil spirits, or something.

After using the power of the summon spirits, the problem gets worse.

At last he said, "I would like to know how to summon spirits."

He is also seen to be able to perform a kind of magic, summoning dead spirits.