After the boss at the bridge rose will disappear but will still be in your party(done intensionally)
if you want to use the cheat you will have to defeat the two mini bosses to get the password to open the superpower code
with this you can beat the final boss easy cause its kinda hard if your not prepared for it.
the two mini bosses are hard to kill do heres the password if you want the easy way out
Password to get the super power code is: 1994
Password to open the super power is: 11111111
Guide to defeating the finial boss without cheat.
kill grunts to get potions
and explore the whole forest map to obtain scrolls and the dropped potions