Synastry is a bit op.

[chumsy]

Synastry: 50% extra healing to 1 target, total extra healing 50%
Divine seal: 30% extra healing to potentially 8 targets. Best case scenario total extra healing 30%X8=240%. worst case one target, 30%.
synastry op? nope.

[Damianqq]

Synastry: 50% extra healing to 1 target, total extra healing 50%
Divine seal: 30% extra healing to potentially 8 targets. Best case scenario total extra healing 30%X8=240%. worst case one target, 30%.
synastry op? nope.

Just a small correction. Synastry doesn't give 50% extra healing. The thing it does is, whoever you cast it on, will receive half (50%) of the healing you do on any other target.

[Kietsu]

Synastry: 50% extra healing to 1 target, total extra healing 50%
Divine seal: 30% extra healing to potentially 8 targets. Best case scenario total extra healing 30%X8=240%. worst case one target, 30%.
synastry op? nope.

That's... not how math works. Functionally, Divine Seal increases your Healing per Second by 30% regardless of how many targets you have. Synastry technically increases your Healing per Second by 50%... if you're not healing the Synastry target and you're not using AoE, which greatly reduces how powerful that 50% actually is. If you're trying to burst heal the tank for something in the rein of T13's Akh Morn, for example, Synastry does effectively nothing for you.
Synastry is really good, but it doesn't outclass the other healing output buffs at all.

[chumsy]

That's... not how math works. Functionally, Divine Seal increases your Healing per Second by 30% regardless of how many targets you have. Synastry technically increases your Healing per Second by 50%... if you're not healing the Synastry target and you're not using AoE, which greatly reduces how powerful that 50% actually is. If you're trying to burst heal the tank for something in the rein of T13's Akh Morn, for example, Synastry does effectively nothing for you.
Synastry is really good, but it doesn't outclass the other healing output buffs at all.

functionally, Synastry only heals 1 extra target, and functionally divine seal works for all healing spells, aka AOE heals. So functionally Divine seal is way more powerful. You dont really need math to know that. Yes I understand that if the other target takes no dmg his effective healing is 0.

[Kietsu]

functionally, Synastry only heals 1 extra target, and functionally divine seal works for all healing spells, aka AOE heals. So functionally Divine seal is way more powerful. You dont really need math to know that. Yes I understand that if the other target takes no dmg his effective healing is 0.

Yes, common sense is enough to know Divine Seal is better.
My initial complaint was your statement that Divine Seal increased the total healing of Medica by up to 240%. :P