Lua TFS 0.3.6 - [TALKACTIONS] - How can I create this magic in an area? Can anyone give me an answer?

function onSay(player, message, channel)
    -- Check if the player has 300 resets in storage 59976
    local resets = getPlayerStorageValue(player, 59976)
    if resets == -1 or resets < 300 then
        doPlayerSendTextMessage(player, MESSAGE_STATUS_CONSOLE_BLUE, "You need 300 resets to use this command!")
        return true
    end

    -- Make sure the player has a valid target
    local target = getCreatureTarget(player)

    if target and isCreature(target) then
        -- Apply massive damage to the target to ensure death
        doCreatureAddHealth(target, -1000000000)  -- Intentionally absurd damage value

        -- Send a message indicating the target was killed
        doPlayerSendTextMessage(player, MESSAGE_STATUS_CONSOLE_BLUE, "You dealt massive damage to the target, killing it!")
    else
        -- If there is no valid target
        doPlayerSendTextMessage(player, MESSAGE_STATUS_CONSOLE_BLUE, "No valid target found.")
    end

    return true
end