There is no healing bonus with Defiance.
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Damage reduction from Inner Beast only last for a few seconds...
With a PLD's strength reduction debuff and a WAR's slash resistance debuff, a PLD+WAR combo will be most optimal. Provided both are decent tanks
And if it did that, they might as well just get rid of the +hp and +healing on it entirely and turn it into a clone of Shield Oath. There's isn't any difference between 25% +hp and +healing and 20% DR, which isn't the same as "a class needs to have 25% +hp/+healing in order to be balanced against a class with 20% DR". There are other mitigation mechanisms that WAR gets that make up for that little cushion, like the +healing on Inner Beast (which, even if it's smaller, is still going to be present) and Bloodbath. It's not going to amount to *much* but it's enough to make up for the fact that WAR will have 20% +healing instead of the 25% that it would require for Defiance to match Shield Oath completely.
The HP and Healing bonus with be about equal to Shield Oath. So that puts Inner Beast to be compared against the other PLD CDs. Isn't the buff 30% for 6 seconds? Cant remember. You'll also be getting a self heal of 400-1000 depending on buffs and RNG. But chances are you will be topped off before a big hit.
Can see way more War\Pld groups forming with the changes.
Basically this. The big difference, other than the 5% buff, for our incomig healing will be having the +healing tied to defiance instead of wrath stacks. Prior to this change losing that 15% + healing during a damage intensive fight was a detriment even with the IB healing.