Here is the fourth raid zone in the expansion. It reuses the map from the Yon Gorroth overland.
Code:
<ImageStyle Name="exp22_dun_yon_gorroth_raid_01" displayname="Yon Gorroth: Voidshell Caverns [Raid]" zonerect="-1482, -1126, 1210, 878">
<ImageFrame Source="images/maps/map_exp22_rgn_yon_gorroth.dds" SourceRect="0,0,800,600"/>
</ImageStyle>