The Dah'ren Mohran is a Monster from the Monster Hunter franchise. It's an elder dragon,and originated in Monster Hunter 4 and its Ultimate update. It was the very first monster you fight in the game,to introduce the new mechanics of 4 Ultimate and to give a feel for the intense gameplay.
In Marvel vs Capcom: Infinite, the Dah'ren is infected with the Sigma Virus and has gone rampant. You must battle some of Sigma's droids and defeat them before the Dah'ren destroys the wall and begins to level the city. It is soon deatroyed by Hulk and Ryu.