The only areas with Hell levels of 63-68 are the Blood Moor (alvl 67) and Cold Plains/Stony Field/Dark Wood (all alvl 68). However, champion monsters are +2 levels above their area, and uniques are +3 levels above, so there are actually no areas whatsoever where you can target-farm the Southern Worldstone Shard. You need to get lucky with an off-level monster.
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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.
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