Smog

Smog is the boss of the fifth dungeon in Oracle of Ages, the Crown Dungeon. He is weak to the Cane of Somaria, which can also be found in the Crown Dungeon. Once defeated, you will receive the Sacred Soil.

When facing Smog, he will break up into several smaller clouds. Use the Cane of Somaria to alter the paths of the clouds, causing them to run into each other. Once all of the clouds have collided, Smog will be made whole again. Attack him, while avoiding his lightning attack, until he breaks up again. After repeating this several times, Smog will be defeated.