help with a custom versus roll

So I am trying to create a custom vs roll and having trouble following through some of the existing examples in 3.5e and 5e rulesets. Essentially what I am doing is taking in a power object that has a source and vs ability that rolls (ex: strength vs prowess). I am able to get the data for each value with bonuses, however, I am having trouble figuring how to add a target diceroll to add to its ability score for the check. Any help would be appreciated.

Code:

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function rollPower(rSource, rTarget, rRoll)
        Debug.chat("in rollHandlers.rollPower() - line 40");
        local rMessage = ActionsManager.createActionMessage(rSource, rRoll);       
        rMessage.text = "[POWER]" .. rMessage.text;
        local nTotal = 0;
               
        if not rTarget then               
                Debug.chat("in rollHandlers.rollPower() - line 46 - no target");
                nTotal = nTotal + rRoll.nMod;       
        --  Create a message from the rSource and rRoll parameters using CoreRPGs createActionMessage function
               
        rMessage.text = rMessage.text .. " | Raw Damage " .. nTotal;
        --  add extra info to the message - we only have the raw damage roll - we dont have any armor info
        Comm.deliverChatMessage(rMessage);
        --  deliver the chat message
        return
        --  exit the function without executing any further steps
    end
   
    if rTarget then
                Debug.chat("in rollHandlers.rollPower() - line 59 - has target");               
               
                local sSName = ActorManager.getCreatureNodeName(rSource);
                local sTName = ActorManager.getCreatureNodeName(rTarget);
                local nodePowerList = DB.getChild(sSName, "powerlist");               
                local sSuccess = ""               
                local nSVal = 0;
                local nTotal = ActionsManager.total(rRoll);
               
                -- check for data
                if nodePowerList then
                        -- get all the list items
                        local lPowers = nodePowerList.getChildren();
                        -- check for data then loop through
                        if lPowers then
                                -- get all the window objects and look for ours
                                for _,iPower in pairs(lPowers) do                                       
                                        local rPower = iPower.getChildren();
                                        -- if its the power we want, lets see how it went
                                        if rPower.name.getValue() == rRoll.sDesc then                                               
                                                sSuccess, nSVal = resolvePowerTest(sSName, sTName, rPower, nTotal);
                                        end
                                end
                        end
                end
               
                -- build out the message some more
                rMessage.text = rMessage.text .. " vs " ..rTarget.sName .. " | " .. sSuccess;
               
                Comm.deliverChatMessage(rMessage);
    end

end

function resolvePowerTest(rSource, rTarget, rPower, nTotal)
        Debug.chat("in resolvePowerTest() - line 101");
        local sSName = ActorManager.getCreatureNodeName(rSource);
        local sTName = ActorManager.getCreatureNodeName(rTarget);
        local sPSource = rPower.power_source.getValue();
        local sPVs = rPower.power_vs.getValue();
        --
        -- Trying to figure out how to add a roll for the target here to add to their ability score for a check       
        --
        local nSourceStat = ActorManager2.getAbilityScore(rSource, sPSource);
        local nTargetStat = ActorManager2.getAbilityScore(rTarget, sPVs);
        Debug.chat(nTotal);
        Debug.chat(nSourceStat);
        Debug.chat(nTargetStat);
        local nResult = nSourceStat - nTargetStat;
        Debug.chat(nResult);
        local sSuccess, nPTValue = testResult(nResult);
        Debug.chat(sSuccess);
        Debug.chat(nPTValue);
        return sSuccess, nPTValue
end

function testResult(nResult)

        if nResult <= -5 then
                return "Massive Failure",-3;
        elseif nResult >= -4 and nResult <= -3 then
                return "Major Failure", -2;
        elseif nResult >= -2 and nResult <= -1 then
                return "Moderate Failure", -1;
        elseif nResult == 0 then
                return "Marginal Success", 0;
        elseif nResult >= 1 and nResult <= 2 then
                return "Moderate Success", 1;
        elseif nResult >= 3 and nResult <= 4 then
                return "Major Success", 2;
        elseif nResult >= 5 then
                return "Massive Success", 3;
        end

end

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Thanks in advance. I've already gone through the thread here https://www.fantasygrounds.com/forum...ns)-in-CoreRPG, but still haven't had my AHA moment.

I just cheated with math.random().