Every Master should have an endgame quest line/chain, not just Zana.

+ More depth and engagement with Wreaclast, especially the lore & characters
+ More "to do's" (Quests) during the end game, which could help especially new players
+ Possibility to improve (end game) (1) Master content and (2) access to it (eg access to Delve, without just plainly buffing Delve access (Sulphite nodes, Sulphite Scarabs), give more Delve access through the quest line/chain) and (3) rewards (give them a bump up).

eg. Part of Alva's Quest Line includes running Atziri with her so she (Alva) can grab something off her (Atziri) dead body.

Alva's quest rewards could be thematic to Alva: Items with IIQ, IIR with open affixes, that the player can multi-mod on the crafting bench to his/her needs.

Niko's quest rewards could be Fossils, Sulphite, and or Item bases (w Delve/Fossil affixes) with open affixes.

Same goes for Einhar, offering you either rare Beasts or Item bases. And Jun.

As Jun becomes a Master, GGG could use her Lore to design new quest rewards, based on those artifacts her Order (Order of the Djinn) protected. Turning the Veiled Mod mechanic on its head: We give Jun an Item with an open affix and we can pick from 3 powerful (Jun Quest Reward Only) crafts to put on.


Yay or nay?

yes.
I hope its being worked in to the game already.