I'm currently working on spells, and I've run into a tiny problem. In the descriptions of the spells, I use the thing to show the damage the player inflicts.

I.e.

A massive fire spell that affects targets within a huge radius of the player. Requires both hands to use. Does damage in a 30 foot radius.

Now, from what I understand, this should show the damage in-game. BUT. It doesn't. It just says MAG in bright letters. Can someone explain the use or mechanics of this command?

Um, does the spell have a magnitude, or is it scripted?
EDIT: Also, I saw a video of your spells, and it looked as if you had changed the color of flames for a spell effect. There's a guy on here that would like to know how to do that, so stop by and give some instruction if you can.

Where are you typing that? The spell description or the magic effect description? In the spell description it has no way of telling which effect's magnitude you want displayed, even if there is only one effect. Instead, write the same thing you posted in the description of the magic effect. If you are using a vanilla magic effect, then you can either duplicate it and change its description or you can write the spell's description without using and instead use angle braces (<>) around the actual numeric magnitude like so: <30> to make it bold.

It's a magnitude spell, but Jaxfire told me how to do it. If you can point me to the guy needing help, I'll give him a run through of it.
Those are in the spell description. I can do what you said for these since they are only 1 effect, but what about ones that have 2 effects? It doesn't show both descriptions does it? I just don't want it to look sloppy. As to just writing the numbers in bold, don't the spells damages change depending on Character skill and perks, and whatnot?

EDIT: Also, is there a <> command for distance of an area affect?

Yes, it does.

There is a thread on here called "change the color pf spell effects" go in there. I wouldn't mind knowing myself actually, I'm trying to make fire that looks like it's "divine".

Sure, I can even make a video if someone can explain how. I have FRAPS, but that doesn't work on the normal desktop does it?