There are quite a few cheats for NWN, but getting them to work is a little tricky.
First, you will need to hit the tilde (~) key and type in "DebugMode 1" (case sensitive). Then hit the ~ key again and press TAB. This should show you a list of the different functions available. Hit TAB again to scroll down the list.
Cheats: (case sensitive)(X is a number)
SetCHA X - Sets your Charisma
SetSTR X - Sets your Strength
SetINT X - Sets your Intelligence
SetWIS X - Sets your Wisdom
SetCON X - Sets your Constitution
dm_givegold X - Gives the X amount of gold to you
GetLevel X - Raises you an additional X amount of levels
dm_god - Makes you invulneralble (does not require you to click on the player character)
On some of the cheats, it will simply give you a message saying "success" after you enter the code and press ENTER. Other ones, such as the SetCHA will say "Entered Target Mode". You must click on your character to enable the changes on your character.
Check out the in-game listing, since it contains a whole bunch of different functions.
alternative cheats:
To use a command line action, you can bring up the console using the tilde key. You can also enter console commands into the chat widow by prefacing them with a double pound ?##?.
ModAge #
ModAttackBase #
ModSave
ModSTR #
ModDEX #
ModCON #
ModINT #
ModWIS #
ModCHA #
ModSaveFort
ModSaveReflex
ModSaveWill
ModSpellResistance #
SetAge #
SetAttackBase #
SetSave
SetSTR #
SetDEX #
SetCON #
SetINT #
SetWIS #
SetCHA #
SetSpellResistance #
GiveXP #
GiveLevel #
runscript NAME
GetVarInt
GetVarFloat
GetVarString
GetVarObject
GetVarVector
SetVarInt
SetVarFloat
SetVarString
SetVarObject
SetVarVector
GetVarModInt
GetVarModFloat
GetVarModString
GetVarModObject
GetVarModVector
SetVarModInt
SetVarModFloat
SetVarModString
SetVarModObject
SetVarModVector
SetAppearance
nwnplayer.ini modification
If you modify any value using the console your character becomes "invalid" for the next chapter. To fix this, change the following setting in your nwnplayer.ini
"Single Player Enforce Legal Characters=1" to
"Single Player Enforce Legal Characters=0"
source - found in comp.sys.imb.pc.games.rpg