on rightclick:
    player is holding a ender chest named "&6&lMistyczna Skrzynia":
        clear {RandomSet.%player%}
        remove 1 ender chest named "&6&lMistyczna Skrzynia" from player
        wait a tick
        set {RandomSet.%player%} to a random integer from 1 to 12
        if {RandomSet.%player%} is 1:
            give a 310 of unbreaking 15 and protection 5 named "&e&lHELM MCDROP" to the player
        if {RandomSet.%player%} is 2:
            give a 311 of unbreaking 15 and protection 5 named "&e&lZBROJA MCDROP" to the player
        if {RandomSet.%player%} is 3:
            give a 312 of unbreaking 15 and protection 5 named "&e&lSPODNIE MCDROP" to the player
        if {RandomSet.%player%} is 4:
            give a 313 of unbreaking 15 and protection 5 named "&e&lBUTY MCDROP" to the player
        if {RandomSet.%player%} is 5:
            give a 378 of unbreaking 10 named "&c&lZLOTA MONETA" to the player
        if {RandomSet.%player%} is 8:
            give a 130 named "&6&lMistyczna Skrzynia" to the player
        if {RandomSet.%player%} is 9:
            give a 276 of sharpness 6 and unbreaking 20 and fireaspect 3 named "&e&lMIECZ MCDROP" to the player
        if {RandomSet.%player%} is 10:
            give a 261 of power 6 and unbreaking 20 and flame 3 and infinity 1 named "&e&lLUK MCDROP" to the player
        if {RandomSet.%player%} is 11:
            give a 278 of unbreaking 10 and efficiency 6 and fortune 4 named "&e&lKILOF MCDROP" to the player
        if {RandomSet.%player%} is 12:
            give a 276 of unbreaking 100 and sharpness 10 and fireaspect 5 named "&e&lWZMOCNIONY MIECZ MCDROP" to the player