bottom of the map? I'm not sure where you mean.The only entrances I know are the gate which I can't use, and the one from the area near the crypt, which seems to be a useless entrance.
If there's another way into it, which map/entrance is it from? Maybe I'm missing something.
I have the other 3 keys at this point, so if there's a way to get into Styx I'd like to see if I can find/get the 4th.
I'm not sure what you mean by bottom of the map I suppose. The bottom of Lethe leads into the backstage where the forum area is, but I can't get into the shortcut inside if that's the one you mean, which I presume is at the bottom left of the map there.
if you know of a way I can get into it, I'd like some direction (don't have to tell me explicitly), but the only 2 entrances I know are the Gate I can't go in, the entrance by the crypt. I presume the shortcut to the bottom left, similar to the crypt one on the bottom right, but it seems like a one sided entrance only.