Trial 146

Finishing blow by pet on 100 experience-yielding monsters of the ghost family on darksday or during Dark weather.

This quest is terrible and difficult. The proceeding ones will make you laugh. I found the best way to beat this quest is too sync down in Xarcabard with someone that is either A: Willing to help fight, or B: Someone who is willing to go Idle while you go nuts. Either way it will be slow and grueling. I think being around level 55 is your best pet when fighting the Ghosts. Remember to let your pet get the final attack, which can be insanely aggravating because the ghost family can often heal itself. Good luck, you'll enjoy getting kicked in the balls more than doing this quest.