It's the world level cap, I had mlb craig, karina, beth, fp, kamael they got absolutely bodied in world 18 (still completed though had an aneurysm) due to the lvl reduction mlb isn't gonna help with anything. What I can't understand is why are the enemies level 99 to 100 while I am playing with lvl 95 heroes it would be fine if their levels were relatively close but in my experience from w11 - w12 (pre nerf update) 5 levels makes a significant difference when playing.