If you get premium are the adventure packs included as part of the premium price per month or do they have to be bough separately?
Also for saga rewards t6 weapn etc will we need to have had access to dragon spine adv pack which has the t6 raid in it?
Adventure packs are stand alone and require you to purchase them. Once bought you will always have access to them both with premium or without.
Concerning the t6 weapon quest you do not need Dragon spine adventure pack but turan and rise of the godslayer are required to finish the quest line for T6 weapons.