Weapons are used to solve puzzles or attack enemies. Weapon Kombat: R2 In Mortal Kombat Shaolin Monks, there are weapons scatter throughout areas.
When in fatality mode, you have to enter a button combo using the D-Pad and the attack buttons. If it's not there, you haven't unlocked it yet. A fatality is an instant kill. Press start, choose "Fatalities", then check your particular character's brutality. Please note you have to unlock a fatality to use it.