I had intended to wait for another member to chime in, but I'll continue us on then. it's not a big post at all, since we're just stepping through the forest, but it's something to keep us going.
Lucretius performs a spot and listen check, rolling 8+2+3(13) and 6+2+3(11) respectively.
According to most charts these rolls are not sufficient to even detect a twelve headed Hydra standing in plain sight, so Lucretius does nothing for the time being.