Liv Rizzlefix is a level 17 quest giver located in Ratchet in the Horde-aligned territory of the Barrens.
She starts the following quests:
[52] Zapper Fuel (Elite)- [55] Volcanic Activity
She gives a hint for the quest The Stone Circle: A large chest arrived for Marvon, but it was so heavy Liv left it by the doorstep. (This hint is less needed now that world objects required for quests sparkle.)
See List of the Barrens NPCs.