Then I guess I'm stuck. I have no idea what I missed, there's just not much to do here.
Hah. I found it, missed the other cavern that you get to by jumping over the two pylons earlier. Now I see the lever you were talking about, and I found the spider, or it found me.
Ahhh, sorry. Yeah, now I also see what the issue was. Sorry about the confusion! I should put in a note that you can climb on grass, I think.
