This is digivolution that a digimon becomes a knight and when its in this knight form its powers are able to beat a mega level with just one hit on the head. But some digimon are capable of beating them with one hit such as a Evil King or Queen. These knights power is unlimited but when the power of the digivices need to be recharged the power that the knight holds is gone and it turns in to it`s in-trianing form. Only a few digimon can do this digivolution.