All 13 goblin sets acquired.
Undermine rares is 150% the way to do it.
Less lag, easier to tag all goblins, WAY more spawns.
Took me about 4 hours of dual boxing two accounts to get the ~520 shards needed.

All 13 goblin sets get.
Undermine rares is 100% the way to do it.
Less server lag, easier to tag all three goblins and WAY more spawns, every couple minutes instead of hourly. Took me ~4 hours of farming, dual boxing two accounts to get ~520 shards needed