Spoiler:

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Well I'm not absolutely sure (I didn't draw out a map while I was exploring the maze) but what I did was get the 3 skulls and place them in the rotating flame heads and then stumbled upon a compound of sorts with 3 doors. I could swear I didn't see the entrance to the compound until after I got the skulls in the heads - though I may be wrong. Either way, I just took every hallway until I stumbled upon an opening I'd never seen before (and in the process I ended up at the beginning of the maze multiple times so I started to remember which paths I had taken before) In the compund you'll see 3 doors - both left and right doors led into rooms/hallways with a stone gargoyle holding a demon key in a small little room (like the ones that you got the skulls out of in the maze). There's a flame trap and a blade trap you need to avoid.

After getting both keys I opened the middle door that was locked with 2 skull locks (one skull lock opens the door and the other the grate in front of the door) and saw the stairs leading down to another door - The Inner Sanctum. Inside the spawn rate is high and you'll be bombarded with minotaurs, scorpions, moongate beasts, and those annoying tongue-hammer, frog-things that keep belching bugs that pin you to walls. Anyway, it's a small area with some hallways that end in alcoves with glowing circles on the ground. The circles are different colors and have a glyph inscribed in them. There's also 2 gates that I can't figure out what to do with. I've stepped on all the circles but I can't get the gates to open for me. Maybe you'll have better luck - let me know if you figure it out.

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