Code :
#include "ScriptPCH.h"
class system_duel : public PlayerScript
{
public:
system_duel() : PlayerScript("system_duel") {}
void OnDuelEnd(Player *winner, Player *loser, DuelCompleteType type)
{
sObjectMgr->HaveQuestKillOption(winner,loser);
}
};
void AddSC_system_duel()
{
new system_duel;
}