The Mage King is a boss from Grandia. It is encountered inside the Spirit Sanctuary. The Mage King body appears alongside Wand which together form the whole monster. The Mage King body has the ability to cast Divide Beam and Howlnado.
Save you MP and SP in the Spirit Sanctuary, since the save spot at the beginning of this dungeon is the very only one. His head and body share the HP, but his staff has it's own HP. No special technique is recommended for this battle.
The Mage King has a weakness to Wind, Water and Earth based magic so ranged magic can take the boss down quickly. As Feena is not active during this battle, Liete may have to spend a lot of this battle healing the party.