A script to roll a version of exploding dices. For each 6 rolled on D6 that 6 is removed and replaced with 2 new D6. This keeps going until there are no more sixes.

Ob-script

on("chat:message", function(msg) {
    const AddTurn = (token_id, page_id, value) => {
        let turnOrderEntries=JSON.parse(Campaign().get('turnorder'))||[];

        turnOrderEntries.push({
          id: token_id,
          pr: value,
          pageid: page_id
        });

        Campaign().set({
          turnorder: JSON.stringify(
              _.sortBy(turnOrderEntries,(o)=>-o.pr)
            )
        });
    };

    if (msg.type != "api") {
        return;
    }

    var message = msg.content;
    var command = message.split(" ")[0];
    var numrolls = parseInt(message.split(" ")[1]);
    var outroll = "ob" + message.split(" ")[1] + ": ";
    var plus = 0;
    var times = 0;
    var ids = message.split(/--/)[1];

    if(message.search(/\+/g)!=-1){
        plus = parseInt(message.split("+")[1]);
    }
    else if(message.search(/\*/g)!=-1){
        times = parseInt(message.split("*")[1]);
    }

    if (command == "!ob") {
        var count = 0;
        var total = 0;
        var roll = 0;
        var first = true;
        var output = "" + outroll + "" ;
        while (count < numrolls) {
            roll = randomInteger(6);
            if (roll === 6) {
                if(first == true){
                    output = output + "[6]";
                    first = false;
                    numrolls = numrolls + 2;
                }
                else{
                    output = output + ",[6]";
                    numrolls = numrolls + 2;
                }
            } else {
                total += roll;
                if(first == true){
                    output = output + roll;
                    first = false;
                }
                else{
                    output = output + "," + roll;
                }
            }
            count++;
        }
        let turnValue = 0;
        if(plus > 0 && times == 0){
            sendChat(msg.who, output + " = " + total + "+" + plus + " Total: " + (total+plus) + "");
            turnValue = (total+plus);
        }
        else if(plus == 0 && times > 0){
            sendChat(msg.who, output + " = " + total + "*" + times + " Total: " + (total*times) + "");
            turnValue = (total*times);
        }
        else{
            sendChat(msg.who, output + "Total: " + (total) + "");
            turnValue = total;
        }
        _.chain(msg.selected)
            .pluck('_id')
            .union((ids && ids.length) ? ids.split(/\s+/) : [])
            .map((id)=>getObj('graphic',id))
            .reject(_.isUndefined)
            .each((t)=>{
                AddTurn(t.id,t.get('pageid'),turnValue);
            });
    }
});