I picked up a Coruscating Longbow of the Destroyer (Absolute Chaos, Evil Blast) and was going to vendor it when I said to myself, "Hmm, I can bypass 26 UMD and this thing would absolutely shred neutrals", so I said what the hey and jumped into the Subterrane to try it on the living spells there. I got some interesting results.
All the types of spells took the full damage from the bow, which pin-cushioned them nicely, with the exception of Destruction, Harm and Finger of Death, which all were immune to the Evil Blast effect. I was a bit surprised, since Evil Blast is supposed to hit anything that isn't evil, so I took out my Holy Burst of Pure Good bow and took a few shots with that. As expected the Holy was procing immune and the PG was hitting fine.
I can't even imagine what mess of classifications would allow for them to be not good and not evil, but immune to one type of alignment damage that was an inclusive one and not immune to another type that is also inclusive in the same intersection.