Yes, you all need to start a new game. OOTM has more content than AP, and one could easily guess that the saves will not be compatible - if not because of the items and the new areas, then because of the new skills. I personally like them - they take out a few less used skills by players and add a few that are much more useful. It would be improper to pay less runes for a skill in KBAP and get an overpowered one that costs more in OOTM, don't you think?
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