This is an enhancement in the Performance Shifter set for Endurance Modification powers, available in the 21-50 level range.
Invention: Gives a 20% chance of granting the power's target endurance equal to 10% of their maximum endurance.
Attuned: Gives a 1.5PPM chance of granting the power's target endurance equal to 10% of their maximum endurance.
Sources and Sales
This enhancement can be "invented" by crafting its equivalent recipe, or it may also be obtained from the following sources:
Invention: This enhancement cannot be sold to stores. It can be sold for ??full crafting value?? inf during Power Respecification, or to other players on the Auction House.
Attuned: This enhancement cannot be sold to stores. ??It cannot be sold during Power Respecification.?? Due to its account-bound status, it cannot be sold on the Auction House.
NOTE: the highlighted account-bound note above would be a separate flag since some attuned enhancements can be sold on the AH. The note would not be highlighted on the finalized article; it is highlighted here to tie to this note.