I found it is super easy to explore one chapter of the epoch event in any form with a full bar of energy and it has a pretty easy difficulty as well. If your hurting for units I would do Mulaneys challenge. I cant explore or even start chapter 2 due to roster requirements of only having r4 5 stars. But you get that free 5-star crystal some generic sig stones as well as some sig crystals for 5 stars. I myself am looking for some sigs for my 5-star Aegon. It also gives you a generic 4-star awakening gem and 4-star nexus as well as some gold and shards. I think the celebrity challenge is a great addition to the game and the rewards for exploring chapter one are pretty cool. It's amazing that back when the 5 stars just came out it was as rare as seeing seatin have a successful, now it's super easy. If I were you and I don't have a clue what your roster looks like at all, I would do Mulaney's challenge first because it ends sooner.
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I’d also try and go for the epoch crystals as well