

Lower level explores will take more battles overall to get those mythstones, as usual, while if they grant a Mimic battle, the Mimic is at E12, so E12 is definitely the right choice, if you can manage it. The actual odds are likely higher since the frequency of horde cards to horde mimics seems to indicate that it's higher than 10%, but with the small sample size to date, that could still be wrong. If each of the three tiers was a 10% chance, each explore result that netted a boss chest to would be a 0.1% chance (1/1000) to earn this achievement. This means this achievement is behind three different layers of RNG, each impacting your odds of it happening by an unknown percentage. A Boss Chest does not drop the troop card at 100% either. But I've seen reported battles that would indicate the second tier battle may be more common (relative to Mimics), though this would still represent a MUCH lower than 10% chance. Since this is a rare-ish event following a similiarly rare-ish event, the exact odds here are also hard to know. Once you do have a Mimic battle, however, there's a chance that upon completion you'll get a Hoard Mimic battle. For example, I went 26 boss chests between Mimics as I attempted to earn this achievement. My current working assumption is that the Mimic replacement is about 10% (1/10), possibly less, but as with all odds without pity timers, you can do this 100 times and never get lucky, so there's no way to know how long it's going to take anyone in particular. Solution for Mimic Menagerie In Gems of War Following the other guide, some percentage of your Explore boss battles will now be Mimic battles.
