I don't know what effect they have on the enemy, but the Emperor, they frighten me.
General Karis on the Valhallans under his command
"Everwhere we looked, giant metal gods duelled with giant metal daemons. The very ground gasped at the weight of them, the very sky shook. We were like ants under their feet. As tiny as ants. Of no more [expletive excised] consequence than ants."
Trooper first class Kel Greydi, Echo Company, Pragar 6th, after Ashek II
The Sabbat Worlds Crusade background book