This reputation is kinda crazy, kinda logical and illogical.
First of all you need to be level 10 to get this rep.
To get this reputation you have to kill the magmar that come to human lands, but not that easy! Only killing the invading race seems do not give you reputation, but the invading player have to have blood on their hand (supposely should have killed human on human land)
The last sentence is what make people think this rep is kinda crazy
Is also kinda logical because if the enemy race player come to fish you dont get rep from killing him, otherwise better call defender of the continental resourses