P.S. Really sorry for cutting the quotes, post was getting too long (3000 chars)

Quote Originally Posted by Ceasaria View Post
- Imagine Angelic Benediction ...
Accounting for leeway in this manner gives a 90s cooldown. And realistically, the average is still 120s since you must've waited until the end of Seraph's duration for that to happen.
Quote Originally Posted by Ceasaria View Post
- The fact I want to cancel Fey Deployment ...
It seems simpler to me to have Summon Seraph/Feo Ul just cancel the effect, rather than requiring a separate skill. Just like using any fairy skill or summoning Seraph right now in ShB cancels Fey Union.
Quote Originally Posted by Ceasaria View Post
- Hmmm, not sure if I have understand what you say about Art of Poison, ...
Art of Poison
Increase by 50% the potency of the current Arsenic, Cyanide and Miasma II affecting the target.
Duration: Time remaining on the original effects.
As worded, this does not mention any extra debuff. You have to keep in mind that when DoTs are refreshed, they always keep their current properties. This is called DoT snapshotting. This is why the "current" part of Art of Poison's description leads to this conclusion; you increase the current potency of your DoTs, which they keep when refreshed.
Quote Originally Posted by Ceasaria View Post
- Yes for Science/Steel, I have looked at Afflatus. ...
WHM Lilies are often kept until needed. Science/Steel, as designed, would not work this way. It would replace uses of Adloquium that are for pure healing rather than shielding (pretty rare), and you'd often only need the first Science/Steel combo for that. Anecdotal evidence: in all my runs of O8-12S and E1-E4S I do not recall having ever used Adlo outside emergencies or shielding for Deployment Tactics. Both cases which would not be covered by Science/Steel. As a movement tool it would be more potent than Miasma II only if you needed to move for a full 2 GCDs. That does happen, but most of the time you can slidecast.
Quote Originally Posted by Ceasaria View Post
- You can remove ~ 6 cast ...
Fairy skills are OGCDs, and Embrace is instant cast. There should be no missing Embraces from fairy skills.
Quote Originally Posted by Ceasaria View Post
In the world of dps optimization, you will summon Feo Ul prepull, ...
T: 0, Prepull Feo Ul, 180s cooldown
T: 30, Feo Ul leaves. Keep Eos up for 30s = 10 Embraces = 50 gauge.
T: 60, Swap to Selene for 30s = 10 Embraces = 50 gauge.
T: 90, This is enough for Seraph. Summon Seraph, 90s left on Feo Ul.
T: 120, Seraph leaves, 60s left on Feo Ul. Keep Selene up for 30s = 10 Embraces = 50 gauge.
T: 150, Swap to Eos for 30s = 10 Embraces = 50 gauge.
T: 180, Summon Feo Ul.

From fairy actions alone you will have 100 gauge at this point, but 180s is also 3 full Aetherflow stacks,
or 90 gauge. Substracting what you're missing for Feo Ul, you're left with 30, or an average of 15 per fairy. This is without using Fey Deployment, which effectively doubles your gauge generation.