Rogue · Assassination · tier 3 · from level 20

Improved Expose Armor

Rank 2/2

Reduces the Energy cost of your Expose Armor ability by 10, and refunds 2 Combo Points when cast with 5 Combo Points.

Doesn't change the damage or healing of any Rogue spell.

Averages, counting crits and misses, for a level 60 Rogue with a typical weapon and no other gear or buffs, against a target your level. Worked out from the game's own data, the same way as the Foresight addon.