Delves: Strategies, tactics and tips

Just finish all the reward stages, so I’ll try my best to answer my own question.

  1. Worth to do it? Yes.
    so many Shards and Treasures, with extra Vault Key, Diamonds, and 2 Minor Chaos Orb.

  2. Minimum Tier? Just 2 (90 gems)
    Except you need a new weapon, then go for it.

  3. Best Strategy? Clear all stage until level 100, then stop.
    Use your best team for it. In actual Underworld, it’s easy enough to farming for end-gamers and doing fraction challenge.

More detail and screenshot here
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