[Game idea to reward mastery ranked tenno]

They will be optional to include when crafting the frame in the foundry. Example you have successfully made the Ember Umbral Cortex and you have farmed the ember chassis neuroptics and systems blueprints. You can use the cortex when building the frame to create Ember Umbra instead of just Ember

[Game idea to reward mastery ranked tenno]

I believe it would be awesome to see a massive new zone to farm with 50+ new nodes to play. Mastery locking different regions of this new zone including their zone specific rewards. If you are lucky you will find frame augment relic fragments. Once you have collected enough relic fragments to create your augment relic you use the relic to access a random mission against level 135 enemies. When you complete it you get gold augments or umbral fragments for specific frames. Collecting the required amount of umbral fragments gets you a "warframe name" umbral cortex, example being Ember Umbral Cortex. The cortex which is optional to use in the build of new frames allows them to be made into umbral frames. I'd say the quest to access this new zone would become available around mastery rank 8 introducing 4 umbral cortexs and then each mastery rank after unlocks new areas allowing 2 more frames umbral cortex to be farmed.