Halloween Event - Boss Order Inquiry

Hello,

I'm fairly new to this game and enjoying it thus far. I'd like to inquire about the Halloween Event. I have ran the Necropolis Woods a fair amount of times (I just reached silver and ran four additional runs) and I have yet to meet Paracelsus. I have fought the other three bosses many times, and I'm stuck on the quest requiring me to beat Paracelsus. Is there any trick to getting him to be the boss or is it just random?

Thank you for the support
Lvl 18 Rogue playing on Samsung Galaxy S5 sport

He appears if the player who started the map is at gold or platinum tier i believe.

I have to disagree. He was my second boss. Its totally random.
Unless a prerequisite is level based, not sure though :)

Like other event 99% sure it's random. Anyone can find him but it's Rly rare. But the higher ur points are the easier ull get last boss. So I think if ur not so lucky ull find him once when ur about gold. If ur lucky 3-4 times

As the event goes on, more and more players reach gold tier, and then even if you are joining random groups it is more likely to encounter the better bosses.

If higher tier then higher bosses appear. (Bronze-low chance, platinum-high chance)