3rd portal is the world in which you can enter only two (eventually to be four) with another player (so if matching your level and battle rating of the opponent is not in a queue, the player is put in a queue at the entrance). At the entrance to the 3rd portal, the player receives a certain amount of energy and full mana, regardless of how much mana and energy was at the entrance to the third portal. First have to defeat the guardians of the portal (to deal with them have to catch in 12 minutes), and then fight with your opponent is another player. The winner will get the opportunity to face off with one of the bosses (the bosses are the strongest monsters that are not on the locations of the 1st and 2nd portals).
Reward waiting at the end of all these trials, includes a large number of resources, diamonds and the chance to knock out a top card (actually the card of the boss).
1) to get the 3rd portal, you must have 2 players with a difference in level is not more than 3
2) the 1st location of the 3rd portal are required to undergo by killing monsters that prevent to pass to the portal in the 2nd location (which you have 12 min.)
3) in the 2nd location all players past the 1st location, conduct PvP for the right to fight the boss (have to survive only 1 player, it’s still 12 min.)