on mcmmo player gains xp:
        - define 2 <context.xp.round>
        - choose
        - title 'subtitle:<&a>      <&7>+<player.flag[exp_drop].add[<def[2]>].as_int||<def[2]||>> xp' targets:<player> fade_in:1t stay:10t fade_out:2s
        - flag <player> exp_drop:+:<def[2]> duration:2s