That is known as the nectar of heaven, that protects the drop that crushes evil.
[AUTO](VC) Limit Break 4 (This ability is active if you have four or more damage) :[Soul Blast (3)] When this unit attacks a vanguard, you may pay the cost. If you do, this unit gets [Power]+5000/[Critical]+1 until end of that battle.
[AUTO](VC):When this unit attacks a vanguard, this unit gets [Power]+3000 until end of that battle.