The dungeon is pretty much the same as B1. Here is a cool preview about D-Terminal B2 Map. Hope you enjoy it!
digimon master dungeon map monster location level guide digivice tamer levelD-Terminal B2 Map Preview
NB : Some digimons like phantomon hasn't been released yet in GDMO
digimon location guide monster level in maze and terminal b2Digimon Master Online D-Terminal B2 Monster List (Level 74-76):
Monodramon, Sinduramon, Hagurumon, Keramon, Cyberdramon, Wendigomon, Phantomon, Groundramon (Mini Boss), Diaboromon (Big Boss)