Warizardworks, nice work. But instead of using multiple text events, you can use goto loop for your script:

on *:TEXT:!*:#: {
  if ($me == YOURBOT) {
    var %x = $1 | goto %x
    :!dice
    .timer 1 1 mode $chan +m
    .timer 1 2 mode $chan +v $nick
    .timer 1 4 msg $chan Hey $nick $+ . To win !dice, you must roll a 6.
    .timer 1 5 msg $chan Type !roll to begin.
    halt
    :!roll 
    .timer 1 1 describe $chan rolls a dice for $nick $+ ... 
    var %dice = $rand(1,6)
    .timer 1 3 msg $chan You have rolled a %dice  
    if (%dice == 6) {
      .timer 1 4 msg $chan You won! Congrats $nick $+ !
      .timer 1 5 mode $chan -m
      .timer 1 6 mode $chan -v $nick
      .timer 1 7 msg $chan Thanks for playing !dice by Wariopower.
    }
    elseif (%dice != 6) {
      .timer 1 4 msg $chan Sorry $nick $+ , you did not win. Please try again.
      halt
    }
    :!endgame
    .timer 1 1 mode $chan -m
    .timer 1 2 mode $chan -v $nick
    .timer 1 4 msg $chan Thanks for playing !dice by Wariopower.
    halt
    :%x
    msg $chan $1 is not recognized as a command.
  }
}

And you don't need global variable. The local one will work fine.