Passing Through a Dark Tunnel                          -      N      - 
(-------------------------------------------------)     - <---(M)---> -
                                                        -      S      -

You have stumbled upon the lair of an intellect devourer and its
offspring.  These quadrapedal brain like creatures feed on the thoughts and
residual psionic energy from nearby beings.  Several of the young, and the
paternal creature start feeding on your energy, making it hard to regenerate
here.
A newborn intellect devourer feeds for its first time, off of you.
A brain, walking on four legs is tending to its young.