In my opinion, the best places to do the bonebeast task are:
One of my favorite spots for bonebeast task is the Mother of Scarabs lair. You can combine the bonebeast task with ancient scarabs at this location! The spot also provides great practice for lower level characters to heal paralyze while aoe hunting.
Mother of Scarabs Lair wiki
Here is a video I helped produce of a level 65 hunting the spot quite some time ago.
https://youtu.be/6aAYWErgJMk
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