Does Grace Period stack?

I was wondering, does Grace Period stack? If I resonating sphere a group and echo the tank so they have 2 reversions does it increase healing by 30%?

No, as far as i’m aware, not certain though. A lot of talent interactions aren’t spelled out unfortunately.

Yes, it does stack and the bonus is multiplicative for a total of 32.25% more healing.

The long version:

The easiest way to test and verify this yourself is to simply 1 reversion on yourself and see how much it heals for, and then echo reversion. Compare the non echo empowered reversion to your base.

So this is a single reversion without grace period.
18:10:58> Your [Reversion] healed You 0 Arcane. (1,165 Overhealed)
Here is a single echo with grace period
18:09:21> Your [Reversion] healed You 0 Arcane. (1,340 Overhealed)

1340/1165=1.1502. So an expected 15% increase.
From this we can determine that grace period does apply to the reversion itself that is granting grace period. Then we echo double reversion.
18:10:19> Your [Reversion] healed You 0 Arcane. (1,541 Overhealed)
18:10:19> Your [Reversion] healed You 0 Arcane. (1,618 Overhealed)
The 1541 is our non echo reversion. 1541/1340=1.15. Again a 15% increase over our other reversion, which itself was already amped 15%. So this is an increase over base of 1.15*1.15=1.1.3225, or 32.25%.

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