In order to do this quest you must have unlocked the Murlock (Mrrl) in Nazjatar.
How to unlock Mrrl vendor
To get access to his vendor you must complete the quest A safer Place. This quest is to escort him to your base. You find the quest at 48.43.
How to get 5 Dense Rocks
- Buy 105 Flatulent Fish from Grrmrlg (Shift + Right click and type the amount)
- Buy 15 Jar of Fish Faces from Hurlgrl
- Buy 15 Bag of Who-Knows-What from Flrgrrl
- Buy 5 Particularly Dense Rock from Mrrglrl
Other posts
- How to get Alunira Mount in The War Within 11.0
- GEAR ilvl in The War Within 11.0 Season 1
- Season 4 Checklist for Gear, Flightstones and Crests
- You can buy Gems in Pandaria Remix
- BEST GEMS in PANDARIA REMIX
- Scrolls in Timerunning Pandamonium - Pandaria Remix
- Short-time power in Timerunning Pandamonium - Pandaria Remix
- 3 Bullions (Dinars) From completing 3 weekly Quests in Season 4
- Learn to craft all Enchanting Crests at once in Season 4
- 6 Super EASY Ways to get up to 515 ilvl Gear first week in Season 4