Level 35-36 was about the maximum level you could get to in D2:ED without using a couple places that can respawn opponents (the best location for leveling was Keara's headquarters, trying to open the inner door without solving the statue puzzle).
I tried to level in several respawn places in DKS, including Keara's headquarters, but they seemed to have fixed this loophole in the remastered game - after a certain number of respawns, you start getting 0 XP for each kill.
