It looks like your intent is for an Ex Misc Tradition with the following basic structure
Major Supernatural: Valgaldrar
Minor Hermetic: Voice of the Dead (Not hermetic...)
Major Hermetic Flaw: Necessary Condition (Runes)
Really I don't see a problem with this as a basic virtue structure for the Tradition itself. It seems ... very much to do what it does well.
Since this is a new Tradition we would be making up give us a few paragraphs of fluff about it just to ground us with in it the setting. What is their name? Where are they from and what is their cultural origin? What kind of magic did they used to do vs what do they do now? What is the philosophy and school of thought that they teach internally? Where are they found now? Do they have leanings in the Order? When did they join the Order and whose side were they on in the different Hermetic conflicts etc. (I could go on...)