Where do you pick up Libram of Voracity?

From Mathredis Firestar, Burning Steppes(65, 23.6); it needs level 50.

Who do you hand in Libram of Voracity to?

Hand it in to Mathredis Firestar, Burning Steppes(65, 23.6).

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Pick up: Mathredis Firestar, Burning Steppes(65, 23.6)
Hand in: Mathredis Firestar, Burning Steppes(65, 23.6)
Level: Level 55 quest, available from level 50
Rewards: Lesser Arcanum of Voracity, Lesser Arcanum of Voracity, Lesser Arcanum of Voracity, Lesser Arcanum of Voracity, Lesser Arcanum of Voracity (choose one)

Black DiamondBorer Beetle 5.2%, Dark Keeper Uggel 4.6%, Crest Killer 3.8%, Burrowing Thundersnout 3.6% and 4 more
Libram of VoracityColdmine Explorer in Alterac Valley 1.2%, Timbermaw Mystic 0.5%, Negolash 0.5%, Dark Keeper Pelver 0.3% and 4 more
4Whipper Root Tuber
4Crystal Force

You will be able to choose one of these rewards:

When you come back

Do not waste my time, ‹race›. Give me what I require. Thirty gold and the components.

On completion

My head throbs... The energies of the vast expanses that makes up our universe... ARGGH!

Take what you desire and leave!