The catapult given in Disciples of the dark gods has a pen of 6 but the avenger catapult in CA has a pen of 4 in the avenger entry. In all other ways that catapult is superior, so is this a typo or are they deliberately lower pen than the normal catapult?
EDIT: The armoury entry at the end of the eldar chapter gives it a pen of 6 as well...
It also has a clip size of 30 in the character entry and 100 in the armoury.
Hellebore