Creep

Skilled at combat stealth, you gain the following benefits:

• Increase your Dexterity score by 1, to a maximum of 20.
• When you make an attack while stealthed, the target makes a Wisdom saving throw with a DC of 10 + your Dexterity  (Stealth) bonus. If the target's passive perception is higher than than this DC, they make their Wisdom saving throw with advantage. If the target fails the save, your remain concealed; on a success, you are revealed as per normal.