From the pet, complete "Reborn in the Dark Side". You'll need Bard at Rank 10 (which can be bought from the /mythsong Rep shop - requires Rank 4 Mythsong) and the Platinum Coin of Nulgath: 2500, which you should only purchase after obtaining every reagent so that you can either sell it, use it with another Orb's quests, or for Quest 3 below.
Use the Reagent Library for details on how to get the following items:
Unidentified 13 x3
Voucher of Nulgath
Behemoth Blade of Shadow
Fiend Token x30