I believe it's 90% damage reduction. My attacks hit for double digits when the one I'm tanking is in Shield Oath.
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Considering how often I will end up tanking something on my bard I have seen the LB damages.... when both of them fully buffed hit me it's 12x~7.5k. So I assume it's 6x7.5k if it's just one buffed. I don't know how much the buff is for but I'll assume unbuffed would be hitting ~4-5k per hit. Still somewhere in the range of 20-30k.
I think the biggest problem would be the Shield / Sword oath knights.
If you could separate them long enough to kill one knight... possibly by having the DPS who is second on the aggro list burst one down to get aggro then move apart. A Ninjas Shadewalker aggro buff might help achieve this?
Or, you could use a lancer with cross class provoke! But, a Warrior could probably out DPS a lancer...
Otherwise, simply kill one before they tether... I feel like this strategy wouldn't be possible with current gear levels though...
Its probably not worth the trouble, in any case!
I think it's doable but i don't see the point, if you manage to fail the dps check with double Warrior you're a bit special.
With 6 extremely good DPS saving all their buffs and an LB you might be able to brute force your way through the Knights, even through tether+shield. Tank will obviously need to Burn an invincible right away, and then nearly every single buff for the next double blade-dance. There is no need for trying to have a DPS tank a knight here.
The T10 Mechanic phase poses a problem tho. The MT can't take the hit because it gives a huge -Physical resistance making every Heel/Cleave a one-hit move and it lasts quite a while; on top of the infirmary debuff. So there are maybe 2 ways of bypassing it: Having a DPS tank the hit or Sac it and survive?
To have a DPS survive you'll need your solo healer to be a SCH and have a BLM and a DRG around. The choice of DPS should ideally be a MNK with Fists of Earth. The BLM will Apocatastasis the MNK. The SCH needs to spend all his time before fishing for an Adlo crit on the MNK, so having a DRG pop Critany here (Which is a good idea anyways) should be ideal. Soil should be down as well. Possibly use Eos instead of Selene for the additional M.Def bonus. This should be enough for the MNK to survive. If this is still not enough, you could do a Tank LB and ensure it works. If this is STILL not enough, have the MT step in (But not take the first hit) to split even more damage. Yes the infirmary debuff makes you take like 0 healing, but with enough buffs you can survive until it wears off, even through Heel.
As for surviving a failed spear, I don't know if its possible. Is it a 100% wipe or just a huge amount of damage? If it isn't completely outrageous maybe a Tank LB3 plus Soil plus deployment Tactics Adlo could maybe make it survivable? Seems fairly redundant to try surviving this with tank LB if you could use use it to not die to the spear in the first place tho, so this is not a good idea even if possible. Either way, if it's possible to survive it you'll need a SMN to raise your healer afterwards.