Magic rampage bata(3.2.6) In Competitive mode there should be 3 other player's. But one of them was..

It was a player wearing the special armor dropped by the snake boss. That's a fire-element armor and it's called the Gorgon armor.

To get it you have to get 30 multiplayer coins, find and kill the boss at the end of a level (it can be found both in solo and multiplayer), kill it and use the 30 coins to unlock the silver boss chest. Its power may vary and it can have up to 15 stars.