Behemoth:
The Behemoth was always one of the most powerful enemies in the
Final Fantasy series. Here, however, it is nothing more than a big
pushover. The Boss's weak point is its horn. Jump onto its back
and lock-on to the horn. Then, start hacking away. If you get
thrown off, climb right back on. The only major attack to watch out
for is the lightning, which can sometimes damage you regardless of
location. The RAGNAROK ability is pretty useful, here, because it
allows you to perform some nice aerial combos.
