Darxel

Hello everyone. I'm having trouble with the main story quest. The quest is called "Shadows of the Past". It asks me to pass the trials of the Tebaru Sanakis with Yatzli. I choose Yatzli and Giatta in my camp and go inside "Access to Naku Kubel", which is where the quest tells me. But there's a horde in there, I kill enemies and they come out again, this is endless, they never stop coming out. The quest tells me inside by a route to an entrance that can't be passed because it's blocked with roots that can't be destroyed, you can't interact with it like with others that can be burned. I don't know what to do anymore, I've gone out, I've entered, I've gone around the whole place and I can't find how to complete this. Anyway, I don't know what to do, I need help please.