What does everyone think about those AST buffs?

[jojober]

Oh man, I didn't know with Synastry I could double heal the main tank... This is... very very nice.

Is this the case? The way I read it is that healing any other party member gave the Synastry'd person 40% heal. Does it in fact give the tank the bonus as well if you heal the tank?

[SerosJourney]

Is this the case? The way I read it is that healing any other party member gave the Synastry'd person 40% heal. Does it in fact give the tank the bonus as well if you heal the tank?

yes...

but if you use it once, you don't have to use it one more time!
'cause you will have the space to heal others in the same time you heal your synastry-partner.....

[ckc22]

Is this the case? The way I read it is that healing any other party member gave the Synastry'd person 40% heal. Does it in fact give the tank the bonus as well if you heal the tank?

Yes it is. Meaning you can choose to use a 573 potency shield on cd. Roughly ~critlo with 0 rng.

[Lastelli]

Yes it is. Meaning you can choose to use a 573 potency shield on cd. Roughly ~critlo with 0 rng.

Wait, what? This is false. Synastry only works for direct healings. In aspected benefic case: 250 base potency*1.05 to account for Noct buff*1.2 for Synastry=315 potency. Then you compute 315*1.3=409.5, which is the potency of the shield. If you want to compute the total potency of the skill while Synastry is on, you just take this shield and add 315*1.4, for a total of 850 potency. Is it strong? Yes. Should you use it? Generally speaking, no, unless your tank will die without such a strong shield. As Aspected Benefic's shield component accounts for 57% of the total potency of the skill, using Aspected Benefic while Synastry is active means you're wasting Synastry because you're using Synastry primary effect only on a 315 potency spell. For comparison, using Benefic II with synastry is 1150 potency. Also critlo shield is around 900 potency (1350 total potency), even with your (wrong) numbers saying "Roughly ~critlo with 0 rng." is just...silly. Critlo shield is more than double the potency of noct AB with synastry when AB does not crit, 1.5 times better when AB does crit.

[AlaulaTheGreat]

Is this the case? The way I read it is that healing any other party member gave the Synastry'd person 40% heal. Does it in fact give the tank the bonus as well if you heal the tank?

Yep it is exactly that.
Say I put Synastry on the tank, I heal the tank for 4000, then he gets healed again for 40%. Not entirely sure if this is a bug, cause the tooltip does not indicate that you should be able to do this. However people are saying the German and French tooltip is corrected for this.