This quest is not available in game.
Defeat Shadra at the altar of Shadra'Alor, then bring her venom to Apothecary Lydon in Tarren Mill.
Take his parchment, and read it at the altar of Shadra'Alor, deep within the witherbark realm in the Hinterlands. This will summon Shadra the spider god.
You will also receive:
- 12,250 experience
- 75 (if completed at level 90)
- 500 reputation with Undercity