Ruby (the missing Carbuncle) will also appear up there.

My FC mates and I used to go into DF from that spot when we first discovered it, just randomly popping in on the ropes near anyone else that was there.

Oh, you know you can actually use your goobbue or magitek mounts to get up further onto that stone ledge above the rope?
It's a bit tricky, you need to walk towards it while getting off the mount so be careful you don't fall.

Though if you do fall you should hit the below ledge on the first rope so you wont have to start all over again.