Editing Legends - Combat Rules (section)

===INJURY AND DEATH===

If you suffer more wounds equal to or exceeding Circle of Mastery squared you are considered Out of Action. For example, a 3rd Circle character would be able to take 9 wounds before being considered Out of Action.

A 1st or 2nd Circle character taken Out of Action will usually be killed unless the damage was of a non-lethal nature (e.g. being punched and kicked into submission). 

A 3rd Circle or better character will not be killed until he has suffered twice as many wounds as his Circle of Mastery squared. For example, a 3rd Circle character would be able to take 18 wounds before being killed.