What's a really good way to go to make a really bad ass war-mage?
Do you mean battlemage? If you do then I have no idea, as I only get that specialization for the Stoic passive.
If that's not what you mean then can be more spefic please?
In Origins, or another?
I usually head for Crushing Prison, Mana Clash, Cold and Lightning, because that gets you Storm of the Century and some handy ways to stop or kill bosses.
For origins, i go for arcane warrior specialization with a few healing spells, there is a sword called spellweaver that is specific to mages as well. if im not mistaken there is also a massive armor set for mages but the name escapes me at the moment
Update: i was referencing the Juggernaut set i just couldnt remember the name
^That's not for mages. AWs can use it, but it's not really the best armor for them, as Juggernaut's elemental resistance bonuses are wasted one them. It's better to give that to Alistair or Oghren or Sten and use another armor set for the Warden (or whoever your AW is), like Cailan's armor.
How about Inquisition?
^What about Inquisition?
What do you think?