WN/Tempest Tournament

The Tempest Tournament was one of two events held to publicly showcase and celebrate the ascension and enthronement of Demon Lord Rimuru Tempest as the King of Tempest and Ruler of the Great Jura Forest. It was at first going to be held on a whim when Arnaud Baurman asked which of Rimuru's subordinates was the strongest, but since Rimuru was curious himself and his subordinates seemed to have taken it seriously as a competition to be known as their master's top servant, they decided to hold a formal and organized event.

Taking advantage of this showcase, Rimuru decided to appeal to other countries in the process. He hired the merchant Myourmiles as the producer and after that's done, he was offered to permanently work in Tempest as the head of financial department which he agreed to. These two sent out invitations, under Rimuru's name to people he personally knew, and under Myourmiles' name to other reputed groups. These people were given seats in the VIP sections, including whom the entire Colloseum could hold around 10,000 spectators.

Four Heavenly Kings
After the tournament was over, the final four participants were given the title "Heavenly King" named after the Four Heavenly Kings.