I think the Rune System is a very good start.
One question I have is are the runes you use on yourself stances? It looks like Tellus is your Tanks stance and Lux is your DPS stance. But then you are allowed to have 3 runes on your player, so maybe it's more like you can mix and match them like you can with your enemy runes? Like you can have 2 Tellus runes and 1 Lux or vice verse or 3 of a kind. Also, does Unda fall under the same rules, seeing as it can effect a partymember? Or is it just a regular cooldown like DRK's The Blackest Night?
I think Flabra and Tenebrae are good but Gelus is kind of underwhelming unless you have 3 of them but it becomes redundant because Tenebrae has a similar effect (increasing damage done onto the target).
I would also like to see your weaponskill combos and how you generate emnity fleshed out more.