Using a shrine in the wilderness sounds like a cool acquisition method! I was afraid the Gift Feats would be totally gated behind feat slots, which would make them a struggle to fit in.
Needing a special items for this is a reasonable requirement. I would like to see additional acquisition methods beyond Saga reward though. Making it a rare drop in chests seems reasonable - that way you get excited when it drops, but if it doesn't you know you can get it at the very end when you're done all the quests.
I am concerned about the regular Offering only being available by playing the heroic content. I myself tend to skip the heroic expansion content while leveling so I can enjoy it in Legendary (and not bloat my bank with the Heroic loot I would be incentivized to hoard). At minimum I'd like to see a trade-down system for Greater Offerings to instead count as regular offerings so you can obtain the base feats.
It could also be cool if we could "offer" existing rare items in order to gain the offering token. Such as:
- A +4/8 Stat Tome
- A suitably sized Siberys Dragonshard (or pile thereof)
- X number of Curse Cards
- Threads of fate
- Stacks of the pack crafting ingredients
- The party's Halfling