Last I saw it in Beta, it was:
- All allies get +50% attack for 4 turns.
- All allies get +16% critical chance for 4 turns.
- All allies get +10% mana generation for 4 turns.
EDIT:
The live game revised this:
- Deals 100% damage to the target
- All allies get +30% attack for 4 turns.
- All allies get +16% critical chance for 4 turns.
- All allies get +10% mana generation for 4 turns.
Thanks to @PraiseGamer91, @Vikingblood80, @Galaktusz, and @HughMickey1492 for screenshots of the post-release changes.