"Telepathy good, yes, very good. And I am no ordinary imp! No, I am Llodaz! I will be prepared!"
The confident words of the imp have the most insightful members of the party slightly confused as no-one promised the imp would join the fight. This boasting, however, is easy to disregard his words as nothing but hot air. After all, he never has the chance to promote himself among true devils.
[spoiler=OOC]Sorry for missing your preparations. Where is Blessing of Evil located? Not sure what does Great Danger entail, but I that is what I would grant you as an answer, at least I consider the risk to be quite big on D&D terms (nothing like 95% chance of failure, that is not how D&D works).
Now, without reading Blessing of Evil, Augury does not suggest you to put very (I mean rnd/CL) buffs on quite yet.[/spoiler]