Imagine a situation: you're a Dread Necromancer with a ring of spiderclimb, and you're stuck in the room with the only exit being guarded by a [nonspecific] golem. You're out of spells, but you still have your ability Charnel Touch, which is basically 1d8 Negative Energy damage per turn, on touch attack. Since it's (Su) ability, it goes tight through Golem's SR (if any)... But does it damage him, or is that bloody thing immune?
Golems are immune to, and I quote:
poison, sleep effects, paralysis, stunning, disease, death effects, and necromancy effects.
which would usually mean that golems are immune to Negative Energy damage since it's a necromatic effect, right? Well... Maybe.
Necromancy spells manipulate the power of death, unlife, and the life force. Spells involving undead creatures make up a large part of this school.
That's the entire description of the Necromancy school, and the splatbooks aren't giving too much extra info. We all know that various Inflict spells and the like come from Necromancy school, but is there anything in the books AT ALL that directly and undoubtedly ties Charnel Touch to "Necromancy Effects"? Even a simple "Negative Energy damage is a necromancy effect" would do, except I can't find anything resembling that.
I'm looking for RAW answers. That is, no speculations, and quotes, please.