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Teleother Camelot is a spell in the Standard spellbook which requires a magic level of 90 and teleports the target player, who has Accept Aid switched on, to Camelot. It is also very popular when training magic.
In the past, this spell may sometimes be used by players who wish to eliminate competition over monsters or resources. This will not break any rules, but is generally frowned upon and will make the offender very unpopular. Turning Accept Aid "off" (in the Options menu) will prevent against this trick. An update changed it such that a screen will come up saying: "(Username) wants to teleport you to: Camelot." You may then choose whether or not to be teleported.