I've always wanted to combine Woodsman III (extra healing) with Medic 3. Usually I get a couple warriors promoted to WII but then lose them to barbs. While shadowing a game on Noble my warrior got XP from huts and I promoted him to Woody III. Then I got a GG and thought, hey, let's make a Woody III Medic. Except that 30 XP can only get him to C1,W3,M1. Think I'll need 50 XP for Medic III. Should I have promoted another unit to M3? Does W3 stack with M3 if the promotions are on different units?