@Ovnidemon
Vols 9-10 of the LN if I'm not wrong, there is a skill that only affects insects that's used all the time (I won't tell which it is or who uses it since it would be spoiler). At some point it arbitrarily affects a vampire without an explanation. This is also applied to the "Death Charm", for example, as it randomply affects things unrelated to the dead or death at all (like, you know, bees). Also, some skills Vandar gets are versions of already existing skills, but they behave differently from their "normal" counterparts, having properties they shouldn't have since no other skill in that family has them.
I don't have a problem with the erraticity of Vandar's behaviour. It makes things intresting and it's pretty much justified most of the time. He represents grey morality: he is as selfish as one could be while still doing as much as possible to help anyone else, while being ruthless to anyone in his way. Except when he literally takes a precognitive choice (again, related to skills. At some point he has to chose between a couple of them and picks one that doesn't seem to make sense, but it's exactly what he needs to defeat an enemy he doesn't even know he will be facing, and whose abilities he doesn't know at that point).
And about he luck, fate and karma; it's actually stated that the lack of the three is carried over from Origin to Lambda, so he should have none of them. And that actually holds true for about half the narrative: the author makes an intentional effort of avoiding using "coincidences", be they good or bad ones, to move the story: everything is done by a character that has prior knowledge of most affecting things. In Vol6 Vandar gets delayed arbitrarily from his journey (this could be intentional by the characters causing the delay, but there is no way for them to know what's about to happen). And due to this delay, he just happens to meet just the right people at just the right time. Again, at that point neither he, nor anyone causing those delays has a way to track the people he wants to meet, neither they have a way to predict where they will be when he arrives. So it's a lucky coincidence, which should not happen.