Board Thread:General Discussion/@comment-26890115-20171010130108

Peeping is a nasty spell because rival guilds can cast this on a party, so they can spy on them when they go into the Boss Room.

A example of this is when the Sleeping Knights go with Kirito and Asuna into the Boss Room on the 27th Floor, and a Salamander guild sends some spies to the corridor outside the Boss Room, and as Asuna and the Sleeping Knights go in they cast Peeping on them.

What happens is when Peeping is cast the caster steals your eyesight and a familiar is sent in with you, and they use a crystal to see what the party is doing. A down side to Peeping is when it is cast it automaticly debuffs all of your spells and wards to the point the Boss kills you and you are sent to the nearest root town. By the time the Sleeping Knights found out about this the Salamanders were halfway to the Boss Room that Asuna had to call Kirito to deal with them.  