The Nature Element badge says only that you unlocked Nature. It does not list steps. Two guide sites describe the same route, so it is included as a community path, not as catalog text.
Reported route
- Find a Nature seed, described as a special vine in the lobby or on a Jungle or Statue map.
- Climb the vine.
- Go through the Green Maze. One writeup says to follow the moon.
- Defeat the boss at the end. Guides call that boss Gaia, and sometimes the Nature boss.
- The Nature badge and element are the stated reward.
Clear adds before the boss if the fight spawns them. That tactic is player advice from the same guides.
Gaia is not a separate name in the 21-badge catalog. If your server has no vine, the route may have moved. Do not treat a missing vine as proof the badge was removed. The catalog still has the Nature badge.
Nature is also the name of a fusion result on a different price-and-recipe page (Storm plus Grass). That recipe list does not match the badge catalog, so it is not used here.