You can find tow kinds of ARENA maps from Editors:
-Funny and Full Customisable ARENA (you can choose Skills, Creatures and/or Artefacts for your Hero)
-Realistic and Full Randomised ARENA (You increase your Might and Magic and all your abilities First/Secondary Skills, like you would in a standar Heroes 3 Map)
I have made an ARENA Map by myself. I can share this Map to you...