Move Silently Skill

General Skills Rules: Taking 10: If you are not threatened or distracted you can take 10 on a roll. Taking 20: when you have plenty of time, 2 minutes or more and faced with no threats or distractions, you can take 20. This does not count as a ‘natural 20’ and indicate automatic success. Generally this takes 20 times longer than normal. You can’t take 20 on any check that has consequences for failure. “1” Rolls: When you roll a natural 1 on a skill check, roll D20 again. SUBTRACT this number from your check. “20” Rolls: When you roll a natural 20 on a skill check, roll D20 again. Add this number plus the 20 to your check. 
Move Silently (Dex)(Armor Check Penalties) Retries: No Requires: as part of a move action.

• Moving Silently: Opposed by listen checks by anyone who might hear you.

Action and DC: 

• Move silently at half Sped - 
• Move Silently at more then ½ speed but less then full DC:-5
• Move Silently at full speed DC:-10
•  Move silently running or charging DC:-20
• Noisy Terrain (scree, bog, undergrowth, rubble) DC:-2 
• Very Noisy Terrain (Dense undergrowth, deep snow DC:-5