first u need to get a powerful meca that has a big health like lvl 12 wolfblade or runehawk or mysraven something like that........ the secret in here is in before u will fight the minoton u will pass 3 health purifier something like that(the medic sign)
first u must heal in the first one u will pass and then fight the minoton he will give 124exp and 1200credits and then dont go to the treasure....go to the healing machine and then repair and w8 for the minoton again and fight it when u defeat the minoton go to the the treasure and u will get 4k+ if lvl 14 and 248exp + if u battle the others u will get more.......dont worry the minoton have 320 life but have a low damage on u...and have a low chance of stunning.... for me the older minoton is powerful but gives weak credits... give a thumbs up plz.....