A warpfire thrower is a relatively small war machine and it is carried between its crew of two Skaven. For this reason it does not have its own toughness or wounds, but is destroyed if either crew member is slain. The warpfire thrower's crew may carry it at a rate of 4". This is 1" less than other Skaven due to the weight of the machine. The Skaven can therefore march move up to 8" where they are allowed to do so.

You can employ warpfire throwers in two different ways. A warpfire thrower can operate as part of a unit of ordinary Skaven troops, or it can fight in a unit together with other warpfire throwers.

A warpfire thrower may be allocated to a Skaven unit before the game. Any Skaven unit may have up to one warpfire thrower. The warpfire thrower counts as part of the unit, and will be affected by the unit's psychological reactions, break tests, and so forth, just like other members of the unit. The warpfire thrower does not have to form up with the unit it is part of, but it must stay within 6". The warpfire thrower will always stand and shoot at enemy who charge it, even if the rest of the unit flees.

Warpfire throwers can also be organised into a separate unit of warpfire throwers. A unit of warpfire throwers fights just like any other unit and may skirmish as described in the Skirmish rules.

If one of the Skaven crew is slain the warpfire thrower becomes useless. The remaining crew member cannot operate the warpfire thrower on his own. If the warpfire thrower is fighting as a unit together with other warpfire throwers the odd crewman should be left with the unit. This odd model can then be removed next time the unit suffers a casualty, without affecting another warpfire thrower. If the warpfire thrower is fighting as part of a unit of other Skaven then the odd crew member may be absorbed into the rank-and-file troops.