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Are you trying to get the buried ones by the infernal stallions? You can only dig them up once after that they get 'locked'.

Silly suggestion, but do you have a shovel in your inventory? You need it to dig up buried treasures.

pack of wild yaks to left of road in gateway by the enraged elephants...they are fast spawners and I see people farming them

Adon is a rare spawn in the corner of that recessed area closed to the guards. I gave up and found him first thing on epic mode.