I copied a 80 paladin over to test it out for my fiance who is a pally tank.
From memory, it's been a few days
, certain abilities store up holy power which can then be used to boost some other abilities.
I thought I had a screenshot of it in action but guess it didn't work rofl. So here goes with a verbal example:
Holy Shock - Grants a charge of Holy Power
Word of Glory - Consumes all charges of Holy Power to heal a friendly target for around 1600 per application (charge ? ) of Holy Power.
Inquisition - Consumes Holy Power to increase your Holy Damage by 30%. Lasts 10 seconds per charge of Holy Power consumed.