E2M4: The Ice Grotto (Heretic)

Walkthrough:

Scour the area taking out all the beasties. Use your new phoenix staff on the weredragons on the ramparts, but remember that it has a recoil and make sure one of the gargoyles doesn't get in your line of fire. There is a darkened alcove with a crossbow to the west. Entering here opens the first secret.

Secret 1: The newly-opened alcove to the north has a tome of power.

Get the yellow key that is in a niche to the southeast then head for the yellow door.

Take out the gargoyles and get the phoenix rod. Wall sections to the east and west will open containing more gargoyles. The teleporter in the northeast corner provides access to the northwest rampart. Get the tome of power and jump from the south side to the window ledge below to get the inferno orb. Go back in through the yellow door. A teleporter in the northwest corner is now accessible, that provides access to the northeast rampart. Get the green key and the other inferno orb on the other window ledge. Head for the green door. Go inside and go through the teleporter. You're now up on the long rampart. Drop down into the town to the west. Take out as many beasties as you can through the open windows of the buildings. The only building accessible for now is the west one. Scour the building for beasties and goodies (be sure to get the chaos device and enchanted shield) and press the switch in the room to the south. This will provide access to the southeast building.

Entering this building will provide access to the small building. Get the blue key. Get the wings of wrath in the small building and head for the blue door. Go up the stairs and take out the gargoyles. Take out the iron lich and any other gargoyles then head up the other stairs. Take out the sorcerer in the small room but don't go through the exit portal yet.

There's still one more secret to find, but to get it you have to get back to the other side of that huge stone wall. The only way to do that is to use the chaos device. This will take you back to the start of the level. Go back to the building with the yellow door. That door at the south end will be open now.

Secret 2: Enter the hallway to trigger the secret.

At the end of the passage is another exit portal. You now have two choices. This exit leads to the secret level E2M9 - the Glacier. The other exit leads to E2M5 - the Catacombs. When you finish the Glacier you will be taken to the Catacombs, so use this exit now if you want to do the secret level.