on death:
if {inbox.%player%} is 1:
if attacker is a player:
if victim is a player:
add 1 to {killstreak.%attacker%}
set {killstreak.%victim%} to 0
if {killstreak.%attacker%} is equal to 5:
loop all players:
if {inbox.%loop-player%} is 1:
send "&6&l%attacker% &aa un killstreak de &65 &a!" to loop-player