E4M1: Catafalque (Heretic)

E4M1: Catafalque is the first level in The Ossuary episode of Heretic Shadow of the Serpent Riders.

Walkthrough
This level is short of ammo so it's better switch to melee and make use of the crusher. You start in small room joined to other two filled with a bunch of gargoyles. Make a run up to the Green Key, this way you can face all of the gargoyles one by one. Collect ammo and vials in the rooms then hit the switch in SE corner of the crusher room, letting you to drop down from the balcony at West.

There you can collect the yellow key, but there are also enough sabreclaws and possibly a maulotaur down the balcony, a few ophidians on the central building, and more in the underground water, and a few gargoyles behind it. The best strategy is running to the key then returning to the balcony where part of the wall raised, to use the teleporter here. There can be gargoyles awaiting too.

You'll end into the central building with a couple of gargoyles. Click on one banner wall and all four will rise. Go out to trigger the pillar in the middle, hiding a teleporter, then return in. This way you'll return to the balcony. Make good use of the crusher to kill the monsters following you. You can repeat the above trick to lure more of them to dispatch.

Past the yellow door there are sabreclaws and gargoyles in the first room. Push the switch in the next room and two passages open in the first room, the northern containing disciples, the southern sabreclaws. Dispatch the disciples in sight then go in the southern room.

The switches here supply stairs to the Gauntlets of the Necromancer. Collecting them trigger an ambush by gargoyles and disciples. Try to escape and fight them without be sorrounded, then collect the goodies. Clicking the eagle wall reveal more disciples and following the passage some sabreclaws. You'll end in the starting room, welcomed by gargoyles and triggering Secret 1.

Return past the yellow door. On the left you can see a switch, and hitting it a teleporter on top of the other stairs becomes available. Go into the northern room, instead, killing another disciple and hit the switch. The floor descends and you can pickup some timebombs. Now step on the teleporter.

You will end in a dark water passage, just North of the outside area, with enough ophidians to kill you. Once dispatched, head to the enlighted area, but look instead for two hanging skulls. Hit the wall there to reveal a teleporter leading to Secret 2, placed on a high ledge outside.

Approach the enlighted area and a pillar descends, carrying a Dragon Claw. Step in and that elevator leads you above the Green Key. The pillars in the crusher room go down showing goodies and more ophidians. Kill them and open the green door. Inside there are gargoyles to kill, and the Hellstaff.

Hit the middle painting on the southern wall, then kill the sabreclaws. Hit the switch and the door opens to the last room of the level. Now you have also two teleporters available. The one in the middle is to return to the starting point, while the one on the NE corner brings you to the upper floor of the final room and more enemies. Stepping on it also triggers Secret 3.

As soon as you walk on the red border, a platform will rise and you have to face some iron liches. Climb the platform to reveal a switch, then another, and finally, the third reveal the end level teleporter.

Secrets

 * 1) In the Gauntlets room, following the passage behind the eagle shaped wall and returning to the starting room.
 * 2) In the dark room in the water, gaining access to the teleporter between two hanging skulls, and getting to the elevated ledge.
 * 3) Past the green door, after hitting the switch, stepping on the teleporter (and collecting a Ring of Invincibility) in NE cubicle, and walking on the uppor floor in the next room.