I'll include all this in my upcoming IC post but FYI . . .
NinjaTeeHart says:
laughing he climbs the ladder and looks over the ledge.
The ladder is in the top center of the map on the other side of the river. You'll have to swim out there or take the boat if you want to get to it. The water is moving steadily but not super fast (the DC shouldn't be too high). It's hard to tell how deep the water is in the dark, but if you walk to the water's edge and do a little bit of looking, you can tell that it is probably over your head but not by much.
oopsylon says:
With a wave of his hand, Nym summons four purplish glowing orbs and scatters them throughout the cave to help his friends (particularly Alissia) see. He sends one up the northward tunnel as far as it can go, one to the east, one on the ledge, and one orbiting Alissia's head.
I am going to guess that you are casting Dancing Lights. It has a range of 120' which is the same range as your Dark Vision, so you can see as far as the light can go up that tunnel. It's a dark, river-filled tunnel as far as you can see. So if you want to send that light someone else, go for it.
somebox says:
Lets roll to see if we can find out anything useful about these mushrooms.
Make a note that you took that sample. If you'd like to spend some time studying these mushrooms at some future time, you can make that roll again with Advantage.