Fel'zerul is a level 60 quest giver located in Stonard in the contested territory of Swamp of Sorrows. He is an orcish warlock who was sent by Thrall to investigate the happenings at the Temple of Atal'Hakkar.
He starts the following quests:
[43] Pool of Tears (Elite)- [44] The Atal'ai Exile
- [50] The Temple of Atal'Hakkar (Dungeon)
See List of Swamp of Sorrows NPCs.