*Rank 1 - Become whisper, become shadow. You are 5% harder to detect while sneaking. You can now knockout humans with a baton power attack from behind.
*Rank 2 - You are now 10% harder to detect while sneaking. You move more silently, while not having a or rifle or heavy gun equipped.
*Rank 3 - You are now 15% harder to detect while sneaking, and deal 10% extra damage when attacking the target from behind.
*Rank 4 - You are now 20% harder to detect while sneaking. You move more silently, while not having a or rifle or heavy gun equipped.
*Rank 5 - You are now 30% harder to detect while sneaking. Running no longer adversely affects stealth, when no rifle or heavy gun is equipped.