Originally posted by Reften:

Originally posted by Ꮥℭტℜ℘ℐტℵ:

Thanks a lot! It helps!

also, if you build on a beach, it's impossible to completely wall yourself off from the outside because creatures can swim around any structure you put up.

This was my first mistake, I fixed it.
But in this topic there was a question about spawning monsters inside a full fence.