Use the chat command "-unlock" to disable the hero level requirements for anything.
The highest level of your heroes determines which features are available for you:
5: Abilities available on Theramore.
10: Random Events.
15: One Equipment Bag.
20: Mount.
25: Second profession.
30: Bonus races.
35: Divine Golems.
40: Bonus heroes and second equipment bag.
45: Second hero and third profession.
50: Boss heroes.
55: Bonus mounts.
60: Second race and third equipment bag.
65: Third hero and third race.
70: AI for yourself.
75: Void Lord can be chosen as hero who can learn different spells.
75: Advanced chat commands from '-helpvisual' can be used.
75 (all 3 heroes): All races, professions and chat command '-maxbosslevels' are available.