How to access Spell Pre-warning visual ID from spell.dbc?

[demonguy]

Now ,I',m studying how to change spell visual by editing DBC file and now i can do it.
But i have a serious question:How can i know the visual ID of a spell?

Yes,most of spell visual information are included in spell.dbc...............But not always

For example, Twilght Elite Slayer in BlackThorn's encounter in DragSoul will cast spell "Charge", and before it casts the spell, There are some auras on his imcoming charge path to tell you avoid it...
I want to change the visual ,But i don't know the Visual ID....

And i have the same problem when i want to change BlackThorn's Shockwave pre-warning , the Smoke on the ground before he casts

So Anyone who knows how to get the visual ID, it seems not in the spell.dbc...