The Only Cure is More Green Glow
Collect High Potency Radioactive Fallout inside Gnomeregan and return it, with the Heavy Leaden Collection Phial, to Ozzie.
Collect High Potency Radioactive Fallout inside Gnomeregan and return it, with the Heavy Leaden Collection Phial, to Ozzie.

The fallout decays after a while, so collect it late in the run and head straight back to Kharanos.
Not yet confirmed by players in WoW Forever; details may differ.
Alliance: Ozzie Togglevolt in Dun Morogh (45.9, 49.3).
Alliance: Ozzie Togglevolt in Dun Morogh (45.9, 49.3).
experience only.
The Only Cure is More Green Glow is a level 30 quest; you can pick it up from level 20. It takes you into Gnomeregan.
Sources: Quest data from ForeverDB.net · ForeverDB: Gnomeregan · ForeverDB: Grime-Encrusted Ring · ForeverDB: The Sparklematic 5200! · Warcraft Wiki: Gnomeregan (instance)