What I've noticed some people do effectively in this kind of format is to kind of gesture in a direction where they think the Warden could fill in detail. E.g. instead of just saying it's an artifact with mythology, you could say something like "a decorative warhelm believed by xenotheologians to be the one mentioned in the Rydoshian doomscrolls" which gives the Warden something to riff on rather than a completely blank canvas.