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Thanks for the review. Did you manage to complete the "true" ending?
I have completed act 3 but I have not completed the Shadow Wars. That said on my first Shadow Wars mission I captured a level 42 legendary orc. So for those that say you have to buy loot boxes that's just not true. I plan on completing the Shadow Wars this weekend and I'll post an update on my blog with whether or not the Shadow Wars is impossible without buying boxes. You will however spend a lot of the silver currency you earn (Mira, mithra?) upgrading your strongholds.
Bottom line you don't need to spend a penny more than the MSRP to clear through act 3 easily. Act 4 it doesn't feel like it yet.