Phar and tal can be bought/traded, but the rest are No Trade and must be looted
Ask Phar'Ahkt "What is the Ewer of Sul'Dae." (the 6th speaking point presented) then "Where is the Ewer of Sul'Dae?"
Each player in a group must place the runes in the monolith to get the update
Caution: If you pick the "I have no more questions. You may go." option, Phar'Ahkt will despawn, and anyone else with you who inserted their runes already may lose their chance to get quest completion. He does sometimes spawn on his own.