Hi Experts! This is the Ritual Chamber (13x20), a simple small dungeon map for your more straightfoward encounters, likely involving activating magic orbs to trigger a door opening or something like that. Or not, because one of your extra variants has zero extra props, it's just an empty space for you to do whatever with.
Your other variant is Volcanic, though there isn't any lava, instead it's a kinda grim, red version with hot, glowing, red crystals. The vibes here are half evil, half furnace-like, so take it in whatever direction feels right to you.