Separated Soul:
As a soul, all I have is time. I'll tell you everything.
Kill them and take the Essense of Drake Lord from its corpse... the Behemoth Leader's Essence... And... the Dragon Beast's Essence... collect them. I will gather my last bit of hatred to cheer you on!
Except you will need many skilled people for this fight - take trustworthy people with you.
(You cannot collect the quest item if you're not in a party)