|Reputation||+150 Sha'tari Skyguard|
... in which you are given a disguise that even a weak-eyed old being could see through, and try to fool a weak-eyed old being...
Open the package, <name>. It is a disguise. It doesn't look very convincing, does it?
Use the disguise to speak with him and obtain the book known as the Adversarial Bloodlines. Be careful, <name>. The disguise won't fool the other arakkoa.
Excellent! This book catalogs the descendants of Terokk's ancient enemies. It is prophesied that their demise will be followed by Terokk's return.
Sahaak won't attack you even if you don't have the disguise, but he won't sell you the book unless you're wearing it.
This is part of the the Terokk's Downfall quest chain.