Changing damage type of spells; level 4 abilities

What file in the map contains info about a spell's damage type (magical/physical)

What file in the map contains info for hero abilities that go past level 3? Is it only possible to increase abilities past 3 with triggers? abilitydata.slk doesn't seem to affect level 4 of an ability even though it has a space for the info.

no one does.

only channel can change it I think

First part is just hard coded into the spell.

Second part - do you have TFT?

So if I understand correctly, each base spell has a damage type set in stone?

And the level 4 abilities should just work? Something odd is going on then. Is there some other file that would override the changes I am making to abilitydata.slk? Or some flag that is telling Warcraft to behave like ROC instead of Frozen Throne?

Why the hell are you editing SLK when you have TFT?

*confused*

The TFT object editor works fine, you know.