Universal Spell Power

Newer effect
Universal Spell Power (USP)is a separate and stacking source of Spell Power multipliers. It is found primarily on Implements as an "Implement USP" typed bonus but also appears on newer items such as the as an "Exceptional USP" typed bonus.

Its stacking nature makes it particularly attractive, for example Exceptional Universal Spell Power found on stacks with Exceptional Devotion found on.

Older effect
Some older items used the name Universal Spell Power for a bonus that affected all Elemental, Light, Postitive, and Negative spell powers, but did not intrinsically stack with other specified spell power bonuses of the same type (Equipment bonus, Insightful bonus, Artifact bonus, etc...). Items that possess this effect have had it's name changed to Potency in most cases.