DeceasedCrab makes Madamluna play Shadowgate - Part 5 of 11

This one's got it all, I think. Two demon fights and a bunch of deaths, some of which are hilarious if you actually considered performing them.

Use Key 3 on the door you just uncovered to unlock it, then Open it and go on through...only to be turned back because of the intense heat. If you Use the Cloak on Self, however, you'll be able to do something.

When you Open the door in front of you here, you'll cause a Firedrake to pop out and knock you across the room. Use the Sphere on the Firedrake to kill it off as well as all the fire in the room. DO NOT SET THE THICK BLACK OIL IN THE ROOM BACK AFLAME WITH YOUR TORCH, YOU WILL DIE.

The room to the north will have a deep, dark chasm. If you try to cross the bridge, you'll be stopped by a troll who wants a gold coin as payment. Whatever you do, DO NOT GIVE IT TWO OF THE COPPCOINS. IF YOU DO THAT, THE TROLL WILL THROW YOU OVER THE CHASM AND YOU WILL DIE. Instead, Use the Spear on him. You'll throw into him and cause him to fall into the chasm. 

To the north is the courtyard. There will be a Cyclops here. Use a Stone on the Sling, then use the Sling on the Cyclops. (Well, that's pretty intuitive.) This will stun the Cyclops. From there, Use the Sword on the Cyclops to kill it. Now that you can do stuff here, Use the crank on the well. Open the bucket to find a Gauntlet. Take it. Then go to the room to the north. DO NOT MOVE INTO THE WELL. YOU WILL JUMP IN AND DIE.

There will be three doors here - two on the side and one to the north yet again. Enter the left side door to find a library. Open the desk drawer to find Scroll 3, Scroll 4, Key 5 and Glasses. Take them. By Using the Glasses on Self, you can now read the black book on the desk.