Post Game Dungeon: Is the dragon the last boss?

[StarFighters76]

In the Post Game dungeon called False Path, I am having a crazy time defeating Vacchus Geotim (the 2nd boss). Is there anything left in that dungeon after defeating it? The room doesn't suggest to me that there is anymore to do after that. If that's the case, I can just end the game there, since beating that boss would be moot.

And yes, I am mapping it out as well lol.