At least that’s what I’ve discovered so far.
1) Innate Conduit passive for lightning blast: The reason I tried this passive in the first place is that the LB chains are each using the full casting cost, which when using lightning wall on a group with the glyph down for more chains drains your mana pool pretty much instantly. I took the passive so I wouldn’t almost always be in the negative, but the first beefy mob I ran into had me a full 3 layers negative before the wall disappeared because the chains just kept casting and draining mana.
I ended up having to replace disintegrate(which I was using prior partially for mana management) with focus because I can’t seem to find a way to completely remove disintegrates up-front cost even though the channel itself is free and it won’t cast while negative.
2) Brand of Deception passive in the Runemaster tree: I have the required passive points for the bonus. It is supposed to apply the brand if the ability costs 15 mana. I currently have a 9 point cost via the actual lightning blast tree(yes, this is 9 after the -3 from the weapon), and an extra 6 from standing in my glyph bringing the total cost for each lightning blast to 15, but I have yet to see the brand debuff on anything.