I know what you think: "power mirage, mantras, stealth and oneshots, what else there is to see", right?
Personally, I don't like the aesthetics of torch for power build (despite admitting, how effective in fact it is). Yet, being a little autistic, still I think of torch as of condi weapon. And I don't like condi that much (probably for no particular reason).
So, started looking for a weapon for the power build. Tried focus, pistol, off-hand sword. And, to my surprise, I found, that off-hand sword is not that bad of a weapon, as they say it is.
At least I could immediately say, that I absolutely enjoy the aesthetics. Having that "17th century duelling" touch and all
Illusionary Riposte seemed like an exceptional ability, with versatility of a daze, block, evade, a huge spike of damage and very short cooldown.
The Illusionary Swordsman, on the other hand, seemed clunky as kitten. Anything more mobile, than a chair could just simply walk away from it. Yet the damage (if everything hits) was absolutely superb.
So, I initially thought of stunning the target, so it couldn't avoid the swordsman. But mesmers don't have that much stuns. Especially now, after Confounding Suggestions was nerfed.
But then I remembered about the trait, called Chaotic Interruption. Which provides guaranteed Immobilize on interrupt. Without GCD. Which means, you can STACK IMMOB.
Which is a pretty big deal, after all: because roots in GW2 not only prevent you from moving, but also from dodging.
Which means, target in Immob can't avoid swordsman. Unless it blows some serious condi cleanse
Well, about that. There's one additional psychological factor, which I think might be important: Immobilize is a condi debuff. It doesn't have a distinct tell, like stun, for example. And people probably not considering it "dangerous", or expecting it to fall off soon. Because, REALLY, have you ever seen a root, lasting longer than 2 seconds? Especially FROM A MESMER, LOL?
Root is indeed a very short condition and people know that. And ignore it, not wasting a precious condi cleanse. And that's where they are wrong.
SW/SW + GS is a main setup. GS being pretty much a cornerstone of ever power build.
SW/SW + Staff might seem as an unorthodox build. And it kinda is. You loose a HUGE CHUNK of ranged burst from GS, but instead you get a glorious Chaos Storm and overall better mobility/utility and survivability through Staff. I mostly play it for fun anyways.
But the good news, is that you can finally get a Power Block (and you'll still have enough clones, because Illusionary Warlock gives 2 by default). And Chaotic Dampening, which is MUCH stronger trait, than Mirror of Anguish.
Illusionary Ambush - IMO it's just WAY TOO STRONK for its cooldown of 20s. Well, this ability is pretty much EVERYTHING. It's an offensive cooldown, since it enables Ambush attack. It's a defensive cooldown, since it confuses the enemy, by detargeting AND teleports you away, if you are too close, while wearing a ranged weapon. It's a mobility spell, because it teleports, lol. (He Protec but He Also Attac, lol)
The most important thing about IA, is thatit teleports not only you, but your illusions as well, NOT FARTHER, THAN THEIR ATTACK RANGE. Which means, your sword clones will do their ambush IMMEDIATELY, after you press the button. Swordsman wll also jump IMMEDIATELY after the use. (One of the BIGGEST disadvantages of the swrodsman, is that it spawns near you and forced to run all the way to his target. Sometimes dying on the way, or simply disappearing, unable to get off from the cliff. IA nullifies this disadvantage ENTIRELY)
So.. yeah.. I'd say, IA is pretty much mandatory as well.
Arcane Thievery - exceptional all-round spell. Unblockable condi transfer, which not only cleanse condis, but also rips boons and gives them to you. AND Slows. AAND Quickens. AAAND it's a super-short cooldown. What's not to like - I don't know.
Though, if you feel really cocky, you can use Berserker. Especially with staff, which kinda provides more protection\regen\aegis, and, therefore, is slightly more tanky, than GS.
Personally, I use Lyssa rune, because of its glorious 6p bonus and its synergy with Mirage's Jaunt. Jaunt basically becomes a SUPERB on-demand condi cleanse and condi transform spell. 1 condi is cleansed before the transform, the rest is transformed into boons. Plus, random boons on heal form 4p is pretty nice too. And passive stats are not wasted either.
Imo, it's much better, than the alternatives.
Though, if you feel like you don't need condi cleanse - use whatever you like.
Obviously, energy sigils, as with any other mirage build. The rest is up to you, really. But I use Absorption on sword (since we do have A LOT of interrupts, after all). And this is pretty much a boon strip for free with 3s cooldown. And Opportunity on GS - because of permaslow from Burden, of course. Courage on Staff, since I'm not sure what else. Though, as an alternative, you can use a Cleansing sigil on staff and some other rune instead of Lyssa. That's up to you.