The Essence of Aku'Mai
Collect 20 Sapphires of Aku'Mai from the crystal clusters on the cave walls.
Collect 20 Sapphires of Aku'Mai from the crystal clusters on the cave walls.

The sapphires are in the cave outside the portal, so you can farm them while the group forms.
Horde: Je'neu Sancrea in Ashenvale (11.6, 34.3).
Horde: Je'neu Sancrea in Ashenvale (11.6, 34.3).
experience only, 1,750 XP.
The Essence of Aku'Mai is a level 22 quest; you can pick it up from level 17. It takes you into Blackfathom Deeps.
All Blackfathom Deeps quests on one map ·Blackfathom Deeps dungeon guide
Sources: Quest data from ForeverDB.net · ForeverDB: Blackfathom Deeps · ForeverDB: Every dungeon quest for the level 20 to 30 dungeons · ForeverDB: The Orb of Soran'ruk · ForeverDB: Seeking the Kor Gem · ForeverDB: Baron Aquanis · Warcraft Wiki: Blackfathom Deeps (Classic)