Well, i don't agree. Don't hate me please (please don't do it

), but on page 31 i read the following things in the general spell description:
"Targeting restrictions vary from spell to spell. However,
unless stated otherwise the following rules apply:
• The target must lie within the Wizard's forward arc.
• The Wizard does not need line of sight to his target.
• The target must be within the spell's range.
• Wizards cannot target spells at units engaged in close combat.
Some spells have a type that enforces additional casting restrictions, or waives others"
I won't quote the DD section because the only relevant element is about templates, so not about DoItza.
Then i read the army book and i see "targets
all the enemy units within 12".
This seems
stating otherwise, at least to me.
Please notice that if you think that this is not a conflict and that AB and BRB can coexist here you can only target enemies not engaged in combat, within the range you choose and
in kroak's (or vassal's) forward arc.
If you agree that this is a conflict then armybook wins.
So yeah, it's a grey area: untill we get a FAQ (or we get FAQed) we can only agree to disagree, but since we can see it either black OR white, not grey, make sure to follow all the restrictions if you go with your interpretation. Don't misunderstand me, i got your point and i think it's a valid one, still i think it's wrong since IMO kroak and DoItza fluff, BRB magic fluff, old DoItza rules and expecially the new rules i've just quoted are pointing in this direction. Oh, and shield of thorns is an augment, not a DD

Anyway i don't want and i don't expect to change somebody's mind, and this is why i always have an additional list ready when i plan to field a kroak bomb list