Signs & Portents, Hand of Fate and Creeping Barrage
If either Vladimir 1 or 2 casts Signs & Portents or Hand of Fate targeting the Conquest, are the blast damage rolls boosted?
I think the answers are:
On your turn - Yes for both (say, if your opponent countercharges through a creeping barrage template).
On your opponent's turn - No for Vlad 1 and Signs & Portents since the duration is your turn, but Yes for Vlad 2 and Hand of Fate since this is an upkeep spell.
In either case both "attack rolls" and "damage rolls" originating from a model are boosted, and the creeping barrage is originating from Conquest.