Hub 4: Gibbet

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The Gibbet is one of the maps accessed from Hub 4: Castle of Grief (map). This is almost like a sub-hub in itself. From here, you can access Hub 4: Effluvium and Hub 4: Dungeons.

Walkthrough
The level itself is a central room connected with an underground library, dungeon, balcony, throne room, and hypostyle hall (where the headless statue of Yorick lies). Beforehand, the player needs to have acquired two books, the Liber Obsura and the Daemon Codex, from Hub 4: Forsaken Outpost.

From the entrance, head South to a stair going down to a small corridor with two bookshelves. The first gives access to a small room and the dungeon part of this level (not acessible yet). The second one opens to the library. The two bookshelf's open in different directions, so beware to not get crushed. In the library, go to the Eastern bookshelf of the central row and place the two books in the empty book slots, thereby unearthing Yorick's Skull (roughly in the middle of the library).

Go now to the hypostyle hall, East from the central room. Placing the skull on the shoulders of the headless statue creates a chain reaction that obliterates the floor all around the player (leaving only an alleyway to the room's exit) and lower the pond in the central room, granting entrance to the Effluvium level.

Bugs
There is a script on this map that requires a very specific condition to activate that the player can accidently render impossible to meet. The script must activate to allow further progress in the game.

In the room behind the Axe Door is a throne that four Chaos Serpents will teleport on to. The aforementioned script checks every few seconds that exactly three remain and lowers walls when the condition is met. However, it is possible for the player to reduce their number below three in those few seconds. In this case the script will never activate and the player will become permanently stuck.

This bug was fixed in the version of the script included in the Version 1.1 WADfile.