Shadra, also known as Elortha no Shadra, is a level 55 elite spider that is worshipped by the Witherbark trolls in the Hinterlands. The trolls use her venom as a powerful poison for their weapons. She is summoned by using at her altar in Shadra'Alor.
Shadra may have created the Stick bug an the Spiders. As Loas are similar to Ancient guardians who have been know to have created other races and creatures. Stick bug might have been the race the Old gods used to create the Aqir?
Patch 4.0.3 (15-Nov-2010): Shadra returns to being a huge spider along with a new model. Her level is also lowered to match the zone.
She was a level 55 Elite.
Patch 2.3.0 (13-Nov-2007): Size has been reduced to a normal size.
The reasons for her no longer being a giant have not been explained. It may be because of mob and pet size normalization.