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Limit the jump range, but also reduce the jump cost, for balance between mages and warriors. For example, without Air Mastery, a jump of 6 cells, with Advanced Air Mastery, 9 cells, and with Expert Air Mastery, 12 cells. For Teleport: 2 teleports with Advanced Earth Mastery, 3 teleports with Expert Earth Mastery per day. Just to start. What Dave suggested was also interesting.
What did Dave suggest? (for those who don't know)