Thanks a bunch for the tips! I'll try looking for this editor. I did manage to find out what all the fields are. I'll use Lull as an example for those that want to do the same.
Spell ID: Lull = 208
In the game, type: #spellinfo 208. You should get a bunch of data on that particular spell. Take a screenshot for later reference. Now if you look in the spells_us.txt and spells_en.txt and jump to spell 208, you should see the spell along with all of the data that's in the screenshot. If you look at the "beneficial" number, it'll be set to 1. If you're confused, just look at the first entry in the screenshot, and compare the rows of numbers along with the spell info in the screenshot. That should basically give you the fields. Now I just changed the 1 to a 0, and saved it. It's now detrimental, so when I cast it the mobs just aggro. :p That small test was just to confirm that I could successfully edit it without breaking it. Note that I didn't edit the client side entries just yet, and the spell worked as intended when I played.
I'm sure that there's an easier way to edit it, but for those that might want a bit more info can do it this way, for now. I'm off to find this spell editor, and I'll report back when I find out more info.
