Stacking Runes.... Sorta

Okay I know there are rune and some cant be stacked and so on....
Can I have Minor rune of death magic, Major rune of death magic, and superior rune of death magic they they all make my Death magic rise?

No, only the superior rune would work. The game will just use your highest bonus rune, but you suffer health loss from all of them no matter if they affect you or not.

I don't think that made much sense.

LOL it didnt but I got it.

Made perfect sense Master Koa.

Wow, I had to read that like 4 times lol. But 'yes' only 1 rune, the highest as Master Koa stated, is the only one used. So if you do choose to upgrade your rune then if you don't have a piece open then just replace the current (lower) rune with the higher rune that you're wanting.
Example: If you have a major rune of Death Magic in your helm and you have a Sup Death magic you wanna put on your armor and all the rest of your armor pieces have something then just pu the Superior Rune over the Major Rune by replacing it.