I was tempted since I have the recipe for it but our raid comp has lots of lusts.
I’ll likely go with Bombardment for teeming/fortified weeks and Harmony for Tyrannical weeks once I get the two of them and save TW for raids only (except for those fights where Bombardment is applicable).
Would like an arcane-only replacement for TW going mage-wide though.
I am very conflicting about whether to make all 3 first and swap between them based on content or just upgrade one first. Personally, I hate having to change out gear/talents all the time and frankly forget to do it half the time. Combine that with the fact that they all sim pretty close to one another in most situations (except for Bombardment which pulls way ahead of Temporal Warp on pure AoE fights but there is only one of those atm) and I wonder whether those extra 50 or so ilvls from a fully upgraded lego might not actually come out being a DPS gain.
I was planning to upgrade my lego before the raid tonight but obviously that’s not gonna happen now with this ridiculous maintenance. I will barely have time to kill the world boss (if it’s even up today) before raid time as it is 
. So I guess I have more time to think about it.
I think what you generally want to do is make rank 1 of your raiding leg and rank 1 of m+ leg if they are different, then focus on maxing 1, then the other. That way you’ve got two (one for single target, one for aoe) and you max them out depending on which content you value more.
I went with TW first because that maximizes my potential in single target raid bosses this week. Next I’ll craft Bombardment. If I’m getting good use of the TW legendary in the majority of Nathria boss fights I will max that one first, if I am not getting good enough use I’ll max Bombardment for M+.
So after spending all evening playing around in keys, I’m really happy I went with Arcane Bombardment first. It was doing 30+% of my damage at the end of each run, incredibly satisfying to see.
But lacks anything visual or “cool” to go along with it other than the enjoyment of numbers.
I spent the night raiding and I am also very happy with Arcane Harmony. It’s second best for ST but it pulls ahead on many fights because they have burst AoE or cleave components which provided great utility to the raid. I am definitely making Bombardment too, though. I just don’t know if I want to do that immediately or upgrade Harmony first.
How is Arcane fairing so far for ST in Nathria? WCL won’t show me any solid data for anything outside the ranked players (and even then it’s not surprising to see UHDK, Boomkin, Hunter all the way down).
It just feels weird to me that Arcane would have strong AoE but be weaker than both Frost and Fire for ST. Not that I care, I’m really enjoying Arc so far this expansion so I’ll stick it out for at least this raid tier.
speaking purely anecdotally - with double lust, arcane power, and full charges - I have yet to OOM.
I can fit 9 or 10 blasts in to the Touch of the Magi window, and 13 or 14 in to the arcane power one. After that I typically have 3 clearcasts pending which regens a fair amount of mana. I then normally have 4 or 5 more blasts in my bag before evocation (clear casts and gem not withstanding). By the time the double lust wears off I’m sitting at around 50% mana going in to the conserve phase with a 4 charge barrage ready, orb off CD, and touch + power coming back in just a bit.
That seems unbelievable. With double hero you get 60% haste on top of whatever you already have baseline so right now something like 70-75% haste for 40 seconds with only the duration of Arcane Power lowering the mana cost… I am sorry but there is no way you came out of that with 50% of your mana still intact. Even without any kind of a haste increase you can’t sustain a 4 charge AB spam for 40 seconds even if you spent all of your mana let alone only half. Something is off.
That said, no question that double lust feels great if a little glitchy coz you look like you are stuttering rather than casting 
but I really question the overall dps increase over the course of an entire fight. Because the burst window is so long there is just no way a mechanic of some kind or the need to move won’t interfere with it at least to some extend and sims just don’t bare that reality out.
Take Sludgefist for example. Arguably the fight that should make the most use out of Temporal Warp. First of all you can’t use it a second time even if you manage to lower your cooldown via Shifting Power enough to fit into the fight’s enrage timer. The reason for that is because the boss gets a soft enrage at 30% making him deal A LOT more damage to the tanks which is why raids would want to save hero for the end. That is further complicated by the fact the entire room or close to it is covered with rubble swirlies by that point which requires you to move quite a bit to avoid that damage so your healers can focus on the tanks who are getting rekt.
Idk, Temporal Warp just feels needless gimmicky to me. If it gave the mage the ability to trigger its effect without also giving everyone else in the group/raid a debuff that would be another matter entirely. It’s a cool effect until you stop and think about the implications and the reality of an actual boss fight rather than a dummy parse.
This is post evocation. I know it wasn’t clear in the original post, but it’s 50% going in to the conserve phase which happens (for me at least) when evocation is down.
Ooh, ok I see, yeah that makes sense now. For a second there I was left scratching my head thinking maybe they finally decided to scale mana regen with haste or something. 
based on my resource logs I think there might be something to that thought. I’ll be checking in about an hour.
Come to think of it, the way WoW used to work is the Global Cooldown (GCD) stopped getting shorter at 1.5 seconds no matter how much haste you had (actually the cap was 1.5 seconds for everyone except rogues and druids in cat form, who had a shorter 1 second cap).
This meant, haste worked on quick-casting spells… but only until you hit this cap. Then you’d get a “stutter-cast”, where the cast would be quick, but you’d be waiting for the GCD to cycle before you could start the next cast.
I don’t have this new legendary and I don’t know if Blizzard changed the GCD mechanic. Could that be happening now? If so, it might reduce the effectiveness of this legendary when used to double-hero.