Warp-raider
From Warhammer - The Old World - Lexicanum
Warp-raiders are Skaven warships of Clan Skryre that can be found in Skaven Clanfleets. [1a]
Weapons and Equipment
They are small, vast ships crewed by insane skaven with paddle wheels powered not by slaves as most Skaven vessels are but by dangerous Warpstone reactors. Although unreliable, they can move the ship swiftly through the waves or fail completely and temporarily leave the ship adrift. A huge tank of warp-naphtha is mounted at the rear of the ship [1a] which is fed into the turreted warpfire projector at the prow, enabling torrents of warpfire to be fired in arc to envelop enemy vessels. However, due to its instability, many of these projectors explode, destroying the vessel they are mounted on. [1a][1b]
Sources