ToME: the Tales of Maj'Eyal

I am running a shadowblade with phantasmal shield. It says it scales with Magic. Then I noticed at one point the damage go up, but my magic stat is unchanged. I looked at lua code and realised it scales also with spell power. So then I realised it had gone up due to equipment change. Can talent descriptions state this more clearly please?

Eg I don't pump shadow feed as I couldn't see the point, but there is now.
Do some talents ONLY scale with magic? YES, quantum feed for example. So this should be differentiated.

From what I've seen, lots of "Scales with Magic" either don't scale with magic, but with spellpower, or they scale with both. Stone Skin in the Earth tree is an example of "scales with spellpower" near as I can tell. Granted, if your magic goes up, your spellpower goes up, but still.

Quantum Feed scales with Willpower (not magic or spellpower).

As far as I know the only "Magic" talents that scale with just magic and not spellpower are the Doomed ones.