I was more thinking of something along the lines of a bonus to stealth, or an increased malus to be hit the further away you are from the attacker, for Chameleon.
I don't really fancy a skill redundant of the Stealth global ability, but limited both in time and actions. It would feel like the Shadowmelt of the Night Elves in WoW.
And:
Scaly Skin(passive)
- The scales covering your body act as a natural defense, providing you with a bonus to physical resistance. However, being chilled will impair your movements and slow your reflexes, making you easier to hit.
Whip tail(active/overwatch)
- So they thought they could sneak up behind you ? Whenever a foe tries to attack you from behind, knockdown and knockback up to 2 foes standing behind you.
I also like this one, submitted earlier by Cattletech:
Elitism - if your stat is highest in the party, it gets boosted by another +1.
but it MAY provide a huge bonus, especially late game.