when i saw it was layer 5 i thought it meant there were 5 bosses to contend with on 5 different levels. when fighting ebrietas we killed each other at the same time and upon my return i found no door to the next level down. i spent hours going round looking for another door or some way to progress. i lost several hundred thousand echoes to those damn pasta faced things and came to the conclusion it must only be a 3 layer at level 5. seems a great place to farm for levelling up though. that room on layer 3 with the little aliens and a couple of bad doggies gives nearly 80,000. not a bad return for a few minutes of hit and run.