The proposal is this:
60 CD oGCD ability. This ability allows you to summon any one of the Primals without consuming a gem. This can be done whether or not the Primal has been summoned within the current Demi-Summon phase.
What is the point of this?
1) Specifically the reason I came up with this - when talking with someone who told me SMN feels bad when you need to hold burst (as a party) for some mechanic, and how SMN has no option but to desync with the rest of the party or spam Ruin 3. This would allow a SMN to push back a Demi up to ~15 sec if needed while still delivering damage.
2) To give SMN more variation in its rotation. This would allow you to summon any one of your Primals an additional time per cycle. Moreover, it would allow you to use the Favors just like normal (so it's a full Primal sub-phase, not JUST the summon animation/attack). I'll give an example of the normal rotation below, but this would also allow you to choose if you want to clip one, and which one.
3) To allow a bit more complexity for those who wish to use it while not really changing the core rotation much otherwise - in practice, you'd simply be replacing one Ruin 3 per cycle with a second Primal summoning and then roll into the next Demi.
4) And to achieve this without totally reworking the Job (again) out from under people who like it as it is; the only change they would need to make to their rotation is to tap this oGCD and then Titan before their next Demi where, right now, they hit their Ruin 3 button instead.
Standard Rotation:
Bahamut, Titan, Garuda, Ifrit(?), Titan (summon only, clipping out the rotation and going into...), Phoenix, Titan, Garuda, Ifrit(?), Titan (summon only, again clipping into...)
Hold Burst Rotation:
Bahamut, Titan, Garuda, Ifrit, Titan (full summon and all 4 Favors spent), Phoenix, Titan, Garuda, Ifrit, Titan.
In theory, you could replace your earlier Ifrit with a Titan and have Ifrit be the one you clip. Or Garuda. Dealer's choice.
The one concern I might have is that this could lead to some unintuitive bit with newer players (like BLM or old PLD with the unintuitive Atonement drops), but I don't think there IS a way to add more complexity that doesn't lead to some unintuitive optimizing that new players won't get off the bat.
The beauty of it is, it's not a burst CD, per se. If you DON'T need to hold burst, you can use it as one, moving your rotation one GCD to the right in the first minute and then having Titan (Summon only) be the first GCD of your burst, followed by your Demi. But in the case that you DO need to hold burst, you do the exact same thing, but you play out the Favors instead of clipping them.
This would overall increase the skill ceiling a touch, have people need to learn that it's optimal to clip Primals (but that's hardly the most unintuitive thing this game has ever exposed players to), and fix the problem of needing to hold burst by up to about 30 sec (since you could also play out part or all of the Summon preceding the last Phoenix as well to pad that a little more).
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I'm not saying it's a cureall, but it's just a micro change that could be interesting and address some problems while not significantly changing things for the people that like the Job at present.