Ah, I see.
It is true though, Greater Malison does not work on Neutral targets, but then Mebble and his gang have low saving throws.
I still do not think it is cheesy though, from a roleplaying perspective, you just described what went on. You wanted to leave at first, but changed your mind.
Alternatively, the scenerio could be changed to that you wanted to deceive them into a false sense of security and gain a surprise advantage.
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