A quick visit back to this Quest leaves me with a couple of comments. First, a one-off "Tempest potion" was mentioned to be seeded in the previous Quest. Was this done? I like that overlap.
Second, those alarm markers are cool and I think something similar for our expansion could make a useful addition to the game in general. Of course, something as simple as skull tiles would suffice, but the extra print space for a small number of alarm tiles should be easy to fit in. The issue is the art, of course. This second edition Talisman image by Gary Chalk could work nicely:
Yeah, it's Games Workshop, but Gary Chalk likely licensed his art at that time. He hasn't protested yet about secondary, nonprofit use by fans. Here's another Chalk image from the more recent Fantasy Warlord that could serve as a sentry token: