I saw these on track as "a bonethug mercenary", not just "Bonethug Mercenary". There were five of them. I didn't see the epic mob, so I guess he had the day off. West exit from the geonid caves.
I sprayed harmony around but still managed to pull three. They are tough. They resist ensnare and savage root a lot. About eight cycles of Immolation of the Sun / Swarming Death / Winged Death, so probably 40K to 50K HP. Hit several times for around 200.
And they dropped exactly nothing, and only a tick or two of AA gained. Basically these turkeys have nothing a druid could want.
Rowacorn
Reluctant Heroes
Bristlebane