Shiga: Easy win
Keep attacking normally with your sword. Do two hits
then do a direct spell. Go close to the enemy and repeat until
your enemy is dead.
Easy hits
When in in a mission with no allies to fight with you,
run around so that your enemies will chase you. When you are surrounded
by plenty of enemues, unleash your S magic. You should make about
100 to 200 hits.
Battle at Mystic Castle shortcut
Once you have opened the two side doors at the start
of the stage and completed the left side, there is a shortcut.
Go through the right door and you will be immediately confronted
by enemies. Use a Jump spell at the correct moment to land on
the platform that takes you to the stairs.
Restore magic
Hold one of the block buttons + [Triangle] and
your magic will get full.
Character recommendations
Naja is the strongest with close range combat and can charge magic
about two to three times faster than any other character. Regardless
of her stats, she also has relatively strong magic and she is
the fastest person. Her only drawback is that in story mode, the
Bosses are more difficult.
Shiga is strong, but not as strong as Naja. He is fast and his
magic is also acceptable (Tornado magic recommended). He is fast
and this is a good advantage.
Tai is good at close range, but not as good as Naja. His magic
is also second best. However, he is slow.
Lani has the best magic and has relatively good speed but she
has the worst attack.