Blessing of Wisdom - Also known widely to other classes as BoW
BoW is a paladin buff - its buffed on a single target or a single class(after 1.90 patch)
The buff regenerates X mana over 5 seconds(check table below), and is a "magic" effect.
COST -REGEN
30mana 10mana pr 5 sec
45mana 15mana
65mana 20mana
90mana 25mana
115mana 30mana
The BoW class buff costs Symbols of Kings