The regen or health boost is seemingly too small. Warlock rifts grant an over-shield but the Crest gives around 1/4 maybe 1/5. Just thinking a grant of half or so would be a little more balanced.
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It's really disappointing. I was expecting something more than a one time small heal that doesn't even start the health regen. Would be a lot better if it pulsed like the pulse grenade to heal over time to full and heal those who jump behind after it's already up.