"This is not what I thought when they said underground labyrinth." Cyrene points out when they enter the dungeon.
It's actually very similar to the one Cain built under the Guild Castle, with carved stone walls covered in paintings, glowing moss on the roof, and solid stone floors cut to look like reddish tiles. It's more like being in the interior hallway of a building than anything Cain would associate with mining.
"There will be large caverns spread through the labyrinth. That's where the mining comes into play, and where the largest number of Beastkin will be." Paige informs them, looking at a point on the wall near the entrance.
"Mary, call all your summons and merge them into a single copy of each type. That will avoid overcrowding and give us some strong backline defense." Cain suggests, and the Puppet Master summons and then Merges what they can, taking the bodyguard type summons into herself for the extra durability.