To beat the boss, Smog, in the Eastern Temple of “The Legend of Zelda: Echoes of Wisdom,” follow these detailed steps:

### Phase 1: Initial Attack
1. Switch to Swordfighter Form: Since Smog is immune to normal attacks, you need to switch to Zelda’s Swordfighter Form to attack it effectively.
2. Use Arrows: Stand back and hit Smog with a few arrows. You’ll know Smog is taking damage when its body flashes white.
3. Restore Health: If needed, smash the jars in the top left and right corners of the room to get hearts and restore Zelda’s health.

### Phase 2: Smog Splits into Three Clouds
1. Smog Splits: After taking enough damage, Smog will split into three separate clouds that cannot be harmed in Swordfighter Form.
2. Redirect Clouds: Use boulders or summon Echoes like the Pot to redirect the clouds’ path into each other. This will cause them to merge back into one big cloud.
3. Attack Again: Once all three clouds have merged, Smog will reform, and you can use Zelda’s Swordfighter Form to attack it again.

### Phase 3: Smog Splits into Five Clouds
1. Smog Splits Further: After another round of damage, Smog will split into five smaller clouds.
2. Redirect Clouds Again: Use boulders or Echoes to redirect the clouds’ paths into each other. This will cause them to merge back into one big cloud.
3. Final Attack: Once all five clouds have merged, Smog will reform, and you can use Zelda’s Swordfighter Form for the final time to defeat Smog.

### Additional Tips
– Use Ranged Echoes: If you don’t have the Bow of Might, any ranged echo or item you can throw works just as well to deal damage.
– Corner Smog: Try to corner Smog in a small area using boulders and careful spacing to make it easier to attack.
– Be Patient: Reuniting the clouds can take time, so be patient and methodical in your approach.

By following these steps, you should be able to defeat Smog and complete the Eastern Temple in “The Legend of Zelda: Echoes of Wisdom.”