Okay, I suggest adding of 3 new skills:
- Occultism - This skill needed to use, examine and destroy artifacts and protect your mind from psychic attack and other mental horror.
- Science - This skill needed to identify, install, repair bionics and use high-tech things like teleporter.
- Athletics - This skill influences your stamina recovery speed, your compensation of blunt damage and chance to avoid penalty to speed for moving over obstacles.
And about stealth system:
Add ability to crouch. While you crouch, obstacles (low objects) counts as high objects (windows, for example) for you. This brings 2 new ‘features’. First, you can crouch behind low objects to hide from monsters’ sight and secondly you can crouch behind low objects to avoid being shot, for example, by turret.