The Gorgos Meteorological Institute, Take 3
You remember the general layout of the place, right? There's the living quarters and odd machinery, where you just woke up. Down the metal hallway, is the elevator back up to the lighthouse. Forming a 'T-intersection' is the weird transparent glass sea tunnel leading to the other part of the station. You haven't been there yet, because there's a small line of blue runes, and Ezekiel's job, at least that he told you, is to guard that tunnel.
Ezekiel the demon grins. "Hey there. Long time, no see."
He looks down at the corpses. "Yeah, well, you know adventurers. They just didn't listen. Look, you guys know the score- enter my tunnel, cross that blue line, and I gotta try to kill you. It's just business. Sad sacks didn't even have a magic weapon..."
He laughs to himself. "Or at least, they didn't think they did. Deal still holds by the way, so if you're looking to add to the 'redecoration'," he indicates the carnage, "then come on down."
Ezekiel doesn't seem to mind you looting these 'sad sacks' though. "Here, lemme help ya." He kicks one of the bodies that was in the sea tunnel back over the blue line to your side, so that you can strip all three corpses of their stuff.
Suit of plate mail, banged up
Shield with a apple tree on it
Quiver of 20 arrows
Flint and tinder
Pouch of 50 gp
Suit of chainmail
Holy symbol of Yolanda Littlefoot, goddess of halflings
Bag of rations
Pack of three other books
Vial of gold dust
Pouch of 10 gp and two gems
As for the spellbook, well let's be fair. Someone roll a d4: on a 1, it's an Illusionist book, otherwise it's Magic-User.
Contains 1d6+3 1st circle spells, 1d4+1 2nd circle spells, and 1d3 3rd circle spells. Roll off chart randomly.