options:
    set {lv.%player%} to 1

command /addxp [<text>] [<offline player>]:
    permission: skript.addxp
    trigger:
        if arg 1 is "3":
            if arg 2 is set:
                add 3 to {xp.%player%}
                send "&73xp付与しました"
                if {xp.%player%} >= 100:
                    set 0 to {xp.%player%}
                    add 1 to {lv.%player%}

        if arg 1 is "100":
            if arg 2 is set:
                send "&7Lv1分付与しました"
                set 0 to {xp.%player%}
                add 1 to {lv.%player%}
        if arg 1 or arg 2 is not set:
            send "&c使用法: /addxp <3/100> <player>"

on death of player:
    execute console command "addxp 3 %attacker%"
    send "&b+ 3xp"