on death:
    attacker is player
    if {k.%attacker%} isn't set:
        set {k.%attacker%} to 0
    add 1 to {k.%attacker%}
    if {k.%attacker%} is 10:
        broadcast "&b%player%のレベルが1になった！"
    if {k.%attacker%} is 20:
        broadcast "&b%player%のレベルが2になった！"
    if {k.%attacker%} is 30:
        broadcast "&b%player%のレベルが3になった！"
    if {k.%attacker%} is 40:
        broadcast "&b%player%のレベルが4になった！"