Fire Emblem Heroes will soon allow units to earn EXP when defeating much lower level enemies

Units will be able to earn EXP when defeating foes that are much lower levels, due to activate in early March.

– The App-Release Bonus period will be extended to 3/14/17 at 2:59 AM.
– The Worldwide Launch Celebration will be extended indefinitely, so the stamina cost for the Training Tower will stay halved and for equipping skills will remain at 0.
– Rewards will be added to the Training Tower between Monday at 2:00 AM and Tuesday at 1:59 AM, starting 2/20/17 at 2:00 AM.

from GoNintendo