[Death by Mirrors]

Exactly. And if you happen to know one of the ghosts (like Obsidian recognizing her sister) then you can also skip the puzzles. What matters is that you get the right magic words for a ghost.

Plus there's still the bonus for candle bearers going on:

Originally Posted by Death by Mirrors

Congratulations!
You have summoned Gal- wait a minute o.O
Okay. Gallagher drops to the floor and the ghost of Gallagher appears floating right over the cauldron. You're all pretty sure there won't be any candy distributed if the one who knows the secret stash location yields the crow a pudding. But how can you apprentices of magic make sure Galla is alright?!

Time for a MINIGAME!

Form a magic circle to ward off the chaotic force evoked by a person who tried to summon their own ghost. To form a magic circle, each cardinal direction must be manned by a sorcerer, wizard or warlock who lights a candle.
Post which direction you plan to cover and show a picture of a candle. This will not exhaust your normal summoning power and you can do so even when you're currently exhausted. Obviously you can only claim one cardinal direction - but you shall be rewarded with 33 candy for doing so.

Only South and West have been taken.