i mean custom ones if skript can't do that u can tell me how to do it by using scoreboard and command blocks here is a simullar command i used before to create the levels and the exp system
/scoreboard objectives add Level dummy
/scoreboard objectives add Exp dummy
execute @a[lm=1,l=1,score_Exp_min=500,score_Level=1]execute @a[lm=1,l=1,score_Level_min=500,score_Level=0]
its was something like that when the players reaches 500 exp the exp resets to 0 and the players gain 1 level and so on so yeah and when the players reaches level 500 if he gain another level the level reset to level 0 again so please i want to make this so bad