I thought it's pretty much unquestionable that it's the Qunari?
Even Tevinter, according to IB anyways, was pretty much just a "Lol we're just playing around" for them.
Not even. What IB says, is typical bravado talk that all soldiers do, it doesn't reflect the nature of the 100 year war between Tevinter and the Qun, if you go in depth and talk to IB about his background he gives you the impression there is a lot more to the war than meets the eye.
QunariStrong PointsNaval Forces - Most sophisticated and largest
Amphibious assault troops - largest number
Military Intelligence - best non magical spy network
Weak PointsSmall number of mages
Great solo fighters, lack cohesion in tactical fights.
Fewest Number of Allied nations
TevinterStrong points:Best & most Mages
Large number of ground forces
Magic powered intel, it's almost like cheating
2000 years of tactical knowledge, best records, best strategies
Weak Points:Little or no Naval Power
Most ground forces are slaves
Weak ties to allied nations
OrliasStrong points:Best Calvary
Largest Freeman standing Army (until the civil war)
Home to the main Templar & Grey Wardens* Strongholds (until the Elder One)
Good sized Navy
Strongest Economy (you'd be shocked how important this is to any war effort.)
Has a good spy network
Best relationship with allied nations
*(Southern GW, there is another Stronghold in the North)
Weak Points:Just had a Civil War (depending on the Inquisitors choices this can have drastic effects)
Just had the Templars (destroyed, reorganized, or merged into the Inquisition) by the Player Character based on your choices
Just had the Grey Wardens (destroyed, reorganized, or merged into the Inquisition) by the Player Character based on your choices
The Inquisitor might have destroyed the economy based on choices
The rest of the Nations & City states:Ferelden - nation of city states, not much of an actual standing force, but some of the best human warriors. Great Allies to independent nations, long held distrust of Orlias. (Could Allie with Tevinter, or other small nations, will support the Orliasan Divine over the Qun/Darkspawn in total war or Blight.)
Nevarra - Long and Proud history, mighty dragon slayers. Great Allies (Would ally with Orlias over both the Qunari and Tevinter, distrusts Tevinter)
Free Marches - Fiercely Independent (Would only fight to protect own lands, might help with a Blight)
Rivain - One of the few Qunari Allies
Antiva - Best Assassins, also fierce Capitalists (Will support the most profitable nation)
Orzammar - Not as strong as they once were, but the Dwarves have fought the Darkspawn the longest, they are some of the most seasoned warriors in Thedas
Anderfels - Home of the Northern Grey Wardens,loyal to the Grey Warden cause. Supposedly Neutral to all else.
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And
Darkspawn - Leaderless until an Archdemon steps up, or they evolve. When under an Archdemon they can threaten the whole world, with out leadership they mill around in the deep areas of Thedas looking for an Archdemon. (when Led the strongest and most difficult enemy of all life, when not led the Dwarves can keep them under control)
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So basically the Qunari are dead locked with Tevinter in a 100 year war, Orlias is at the weakest they have ever been, and everyone else is a backup player in global story telling.
The world is so ready for a Sixth Blight... I know only been 10 years since the 5th, that's why it's going to happen, the Big one with 2 Arch Demons!