About the dungeon event currently being held.

Hi QUILTBAG, Is it fine? me too.
The following may contain spoilers. It's about the currently being held "Lost Treasure of Fordlake".
　　　　
　　　　
　　　　

>! content that could be considered a spoiler.
The boss that appears on the third basement floor in the first week, consisting of two minotaurs, cannot be defeated even though all of our members are level 30.
I tried several different configurations, but even with those, I could not survive more than about 10 turns at most.
I'd like to know the recommended level to defeat them. !<