invented to keep out the cold
Good, they are looking into the sewers. The otyugh was terrifying and she doesn't want that to happen again.
...and also this is exactly the sort of thing Academae students join in on when they need to circle up. The Academae itself sometimes is enough pressure to force them up to second, but it's not fully consistent. Students fall behind, and eventually they need to be casting second circle spells to keep up in their classes. Julio and Anton aren't the first to dive into the sewers. They were just lucky enough to be hunting for something in particular, something which could fund enough of a group to get them back out of the sewers afterwards.
The guard is always looking for casters. Magic is an incredibly useful tool for diving through the muck and mud. They'll never object to better senses, either, and between her darkvision and her shadow's sense for objects in its vicinity, she can provide those. She can't prepare whatever spells they're looking for, but even if they expect undead, there are enough living threats in the sewers that Color Sprays and Rays of Enfeeblement will be of use. And, of course, she does need to circle up herself, now that the visions have served their purpose.
She makes her way to the guardhouse. What are they asking for, arcane caster-wise? Can she fulfill the requirements?