WoW Classic: Onyxia Attunement Horde Questline
1) You can start the line at level 55. Go to Badlands, Kargath and speak to Warlord Goretooth in the tower. Speak to him again to receive Warlord’s Goretooth’s Command. Use item to take Warlord’s Command.
2) Travel to Blackrock Spire. Defeat three bosses and get the documents, they spawn at random near one of bosses.
4) Speak to Eitrigg in Orgrimmar, at Thrall’s Chamber.
6) Travel to UBRS and slay Warchief Rend Blackhand.
8) Find Rexxar, who is patrolling from north Feralas to Desolace.
9) Deliver Rexxar’s Testament to Myranda the Hag in Western Plaguelands.
13) Here begins a line of quests.
NOTE: Always use amulet to speak to Emberstrife, don’t destroy it.
The first one is The Test of Skulls, Scryer. It’s completed in Winterspring, cave of Mazthoril.
You have to be in a party to defeat Scryer.
18) Slay General Drakkisath and loot the quest item in Blackrock Spire.
NOTE: ALWAYS keep amulet in bags and never destroy it. Once it is in your bags, you can enter Onyxia’s Lair.