WoWDB

Granted when you turn in 12 Pit Fighters  for the quest Master Pit Fighter -it will show up once after u turn in the very first trinket.

You have to gather ONLY 12 trinkets! first quest does not remove it from you bag.

You will be awarded with Master Pit Fighter.

Ive got it on my lvl 85 mage in past month. Simply find an abandoned realm (there are sadly many of them) and pick the trinkets at hours like 3am, 6am, 9am... no people around at this time. 90lvls start coming for trinkets usually at 12pm till 9pm.

Cheers.