Greater Daemons

All the special rules for daemons apply as described in the Warhammer rulebook. In particular, note that the Great Unclean One has a saving throw of 4+ due to its daemonic intangibility and, in part, to the fact that it is very fat indeed.

Terror!

The monstrous Great Unclean One is vast, horrible and rank. The psychology rules for terror apply. Remember monsters that cause terror automatically cause fear as well.

Stream of Corruption

The Great Unclean One can vomit over its enemies - this is worked out in the shooting phase. The extent of the vomit is indicated using the extended teardrop-shaped template, the same one that is used for dragon's flame and fire attacks. Position the template in front of the daemon, so that the broad end lies away from the daemon and the template covers your target. Every model under the template must attempt to dive aside in order to avoid the vomit. To dive aside models must roll equal to or less than their initiative on a D6 (ie humans must roll 3 or less). If it fails, the target automatically takes 1 wound. A roll of 6 always fails, even if the target has an initiative of 6 or more. There is no need to disrupt formations by actually moving models aside when they jump out of the way, it is enough to imagine that they do so.