Octomammoth (Final Fantasy IV 2D)

The Octomammoth, also known as Octomam, is a boss from the game Final Fantasy IV. It blocks travelers using the Underground Waterway to reach Damcyan. Tellah has trouble defeating it, and recruits Cecil and Rydia to do it.

The Octomammoth was once an ordinary octopus that was mutated heavily by unspecified "underwater experiments." Tellah comments that it's "an octomammoth," indicating that it's not the only mutation of its type.

Strategy
In all releases of Final Fantasy IV besides the DS release, Octomammoth is very weak. It only uses physical attacks during the entire battle, none of which are very strong. Cecil should attack while Tellah and Rydia cast Thunder. Octomammoth should perish with minimal difficulties.

DS Strategy
The Octomammoth can be rough if you haven't been battling along the way. Cecil should have collected the Shadowblade and some Hades type armor and equipped them. Have Cecil use Darkness, and have him use physical attacks with Darkness status. Have Tellah and Rydia use Thunder, and occasionally, if you have the MP, summon Chocobo with Rydia. Heal with Cure or, hopefully, Cura when Cecil and the others get weak. You will notice that after losing a percentage of HP, the beasts tentacles will vanish, when it has about 4 left, Tellah will warn you that a wounded beast is dangerous. After this, the Octomammoth will slow down, but deliver massive hits that could possibly defeat Tellah or Rydia in one hit, and leave Cecil weak. Use cure magic more often now, and continue the previous strategy, and it will lose all of its tentacles and vanish.