When you use Deployment Tactics?

[Tranquil]

I just use it for Adloquiums in general. I see very little relevance for using it to spread Eye for an Eye unless it aligns well with an add-spawn and said add spawning at such a time wherein you have not lost a good chunk of E4E uptime until then anyway, in having held out your E4E for that Deployment Tactics cast. (I.e. it would work nicely in T7-like situations for the OT, what with the first adds spawning, as they hit hard and don't die fast, with your raid not needing mitigation over time too much, barring for some fireballs).

So basically, if your OT benefits of an Adloquium+E4E more than the full raid does of mitigation for the next 2 minutes - then go for it, but otherwise, no, and save it for a raid-wide shield. (Triple-dipping so that all those conditions are met is possible too, like, say, p1 to p2 transition in T13).

In essence, if not for the aforementioned OT-prepping, you should treat DT as something with which to mitigate better than you would with Soil and also for omitting an AOE-heal altogether where you would normally have to heal or where you'd have your partner heal (except for very big bangs, but at least it is great mitigation then).

Ideally, you're anchoring your DT off of your fairy. It is too risky (most of the time) to heal up your MT and then trying to land that DT before they take any subsequent damage (thus crippling the shield). There is also the fact that you and you alone control your fairy - you know where it will be and you can eyeball the 10y radius perfectly. Casting it on some random player who is stacked up fine is okay, but you will always be taking a risk.

Thus, if you are a SCH who is very raid-aware and fairy-aware, you will have no troubles nailing your fairy placement and even re-placing for situational quirks such as the perfect DT Adloquium, wherein your MT and the whole raid get the shield on them.

As to when you should be using it: barring the OT-prepping - any time where you know AOE damage of enough significance is coming up, but still making it so that you don't essentially blow the cooldown on something less significant, meaning you will not have DT up when you actually need it more. Knowing the fight's specs and your co-healer's habits (in 8-mans) will help immensely, as you can lay out a "DT-rotation" in a similar way you would map out Virus usage throughout an encounter. An encounter can have multiple different phases and the usage can vary, though.

It's very situational and depends on the encounter, but ideally you will want to max out effective uses over the time of an encounter, whether for raid-wide mitigation or for OT-prepping.

[Shikiseki]

Quite situational and hard to use. As for Alexander there are a few times where I like to use it. For example A1 - boss readies to jump up, cast Adlo on tank/WAR and throw E4E while running to the safespot placing sacred soil. Then deploy the buffs and giggle (especially if it crit).

A2 - this is a fun one, sometimes a dps or the fairy stands quite conveniently to spread the buffs to both tanks. Spreading E4E here is super nice

A3 - right before his cascade (cause that thing hurts a lot) also good for spreading E4E during his double slap phase...

Or another example, A4 - after the legs are killed, people usually rush under the boss , cast both buffs on tank/WAR or whoever is placed the best and deploy away.

It's a fun spell to use really.