Kessie wrote:
Well, I read a book where the magic users set up all kinds of crazy magical traps, according to their skills. They were defending the perimeter of a mansion, with a wall. So the strongest magic users set things like quicksand, bottomless sewage, electricity, things like that. The lesser mages, like gardeners, grow giant spike plants and thistles and brambles along the walls. The chefs and servants make rotten food traps everywhere.
Then there's Home Alone. :-)
Ooh. Thanks for the ideas. They're inside a building (a giant clocktower, actually) so the plant ones might not work, but a variation on the quicksand and the electricity are good possibilities.
Lycanis Mimetes wrote:
*thinks* Well, not knowing a lot about how the magic works exactly, it's kind of hard to think of ideas, but here's a general one I have...
For a spirit or something you could have a vial with blood in it that could be meant to either distract the being, or draw it into the bottle (which would have to be pretty special to hold a spirit in it xD).
I don't exactly know how the magic works. 

 Although I guess the way I've been thinking of it involves setting things up with rituals that include such things as chanting and blood-letting. Probably sometimes painting symbols with said blood and similar things. The one spell that's actually witnessed in the story has chanting, walking around, bloodshed, and a suicide. That was an extreme case, though--generally death isn't required.
No spirits, though: the possible summoned beings are fully corporeal, just also more or less immortal. Something that will kind of distract/pull one of them in a particular direction and then stick him in place might be possible, though.