snare/root stacking
 

I'm trying to figure out how to disable the stacking of snare/root spells but I cant figure it out. I think I have to modify spells.cpp but I'm not sure what to do, can anyone help?

what i want to do is make root spells overwrite and block snare spells, which appears to be handled by the database. how do i add stackingcommand to my spells via nulls spell editor to block/overwrite snare spells?