You have 2 choices my friend :
1) either defeat enemy in manner that is acceptable for you (you didnt say difficulty lvl, and loss/no loss conditions)
2) load game before you left that island and leave it safe, without enemy on yuor tail.
i have feeling 2 choices isnt an option because you said you lvlup and fought some battles in mean time,so i guess your stuck with 1 battle 10 lvl higher enemy hero
