Trader -> Spoiler should be said when youre gonna say info about the game that a player that hasnt played it wouldnt wanna know. For example, if youre gonna say "mr X will ask you to do something but then heŽll attack you", you should say "spoiler" first so that a player that doesnt know that doesnt get spoiled and misses the fun. Its not the same playing for the first time than playing knowing what will happen. Also telling objects location or attributes is considered spoiling.
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"TEEHEE !!!!" -The Mighty CloudQueen, to Ertai