Rogue · Subtlety · tier 1 · from level 10

Master of Deception

Rank 3/3

Reduces the chance enemies have to detect you while in Stealth mode as if you were 3 levels higher.

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.