This article is based on a discussion between the above mentioned persons on the Direwolf mailing list on what a Skaven Castle should look like and how the Skaven would Defend it.

Normally warmachines deployed in the towers may not move off the tower, however portable Skaven warmachines such as Warpfire Throwers and Jezzails may move around as they wish.

Poison Wind Globes
The globes can be thrown in the shooting face as normal or be dropped at a unit in basecontact with the wall or tower as a stand and shoot reaction or in the shooting phase. When the globes are dropped place the template like a cauldron, directly below the globadier and in front of the wall. When the globe is being dropped don't roll the scatter dice. A battering ram receives its 4+ save as they can breath air trapped under the mantlet instead of the gas. If globadiers are attached to a unit they may stand and shoot against units touching the wall and they are not forced to evade. Globadiers can be placed in a unit to allow it a better place to drop the globes. A hit from a wind globe causes a single wound on the roll of 4+ with no armour save possible. Any Skaven character can buy a supply of Wind Globes as a magic item for 25 pts, this item may be duplicated.

Warpfire Throwers
Warpfire Throwers are able to burn attackers to a crisp before they reach the wall but they can't hit a unit in basecontact with a wall as the flames always shoot forward. To come around this you are allowed to aim a Warpfire Thrower down at the base of a tower or wall. In this case place the 2" template just like a cauldron, directly below the Warpfire Thrower and in front of the wall. A Warpfire Thrower is allowed to stand and shoot at an attacker using either a shooting flame or wait till the attacker is in basecontact with the wall or tower and then aim at the base of the tower or wall.

If the Warpfire Thrower explodes than all models on the same level or lower within D3+1" are hit. Models one level higher are only hit on the roll of 4+ and models two levels higher are not hit at all. EG a Warpfire Thrower on the ground explodes and the walls are showered with Warpfire but each model is only hit on 4+, the towers are not hit at all.

As a sidenote a Warpfire Thrower used to attack a castle can fire the stream of Warpfire at the ramparts and is treated like a stone thrower or any other template weapon as on page 12.

Doomwheel
The Skaven castle features several gates or openings and large passageways. Some gates contain a ramp that will allow a Doomwheel to gain speed as it sallies forth. These gates halve movement for an attacker moving upwards and Skaven defenders at the top count as being on higher ground.

To open the gate the Skaven player need only to declare that the Doomwheel wishes to roll down the ramp. It's assumed that two slaves open and closes the gate for the Doomwheel. If any other models wish to move out the gate they need to open it as normal.