This command will remove a specified amount from an actor value of your currently selected target. An actor value is a value given to character traits to change their characteristics - e.g. 'Health' controls amount of hitpoints an NPC has. See actor value IDs here. Use 'player.damageav' to change your own values.
damageactorvalue [actor value id] [amount] Target Command
|Actor Value ID||The ID of the actor value you wish to decrease.|
|Amount||The amount you wish to decrease the specified actor value by.|
This command is an alias of the DamageActorValue command. It has the same function, but is shorter (easier to type).
damageav health 10
The above command would take away 10 health from the NPC you currently have selected as a target. To select an NPC/object as a target, click on it whilst the console is open.
player.damageav magicka 5
The above cheat would take away 5 magicka from your character. The command affects your character and not your target because the 'player.damageav' command was used (instead of just 'damageav').