Paradoxically for the game name, he is probably the easiest of the 3 Uber bosses, as he is a stronger version of Diablo Clone but has nothing else special, compared to Uber Baal that can be really annoying with his TP, quickness, double and even worse Uber Mephisto with his Conviction Aura.
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Squelches this trader, making their offers on your trades invisible to anyone except themselves. Their trade listings will also be hidden from your marketplace.
Your squelch list can be managed and edited from Top right dropdown > Account Prefs > Squelches.