How do you get to the elder on the 3rd planet of spore hero arena?

There's a big Spore blocking your entry, the type of tall rock you hit repeatidly to make the bridge link, is the same next to the big spore.You do the same thing to this one.The rock will hit it's head and it will move it's tail letting you enter.But before you talk to the elder, destroy the nests trust me. You would have to go through a hassle if you didn't.