Yea ledge across from the Louhi ledge, ake a mount, magicite in defence and just rush through it past the horus spawn cave, out the other side to where you are talking about (it' actually a nice area but is almost certain death) just run past the snail things, past the floaty eyes/Anubis and fall off the end. You'll land on the area where the Demons spawn next to the lvl 21 aetheryte (and probably lose any aggro you gain on the way down)

I wouldn' tbother trying to sneak as if you get killed it's probably unlikely anyone will attempt a raise in there. Together with the back side of the Louhi cave (Chimera) are just pure evil. SO just Run as fast as you can from entrance to the cliff edge is my advice lol