Does this give too much away?

[Vamprey]

Screams sub-plot to me. Someone or something steals the glasses to use for its own nefarious plans. Can the PC's find the thief/s before the glasses are destroyed? Can they track the thieves at all?

Easy way to remove the glasses from play, placing another item in its stead that won't interfere with your future and larger plans.

 

[Starglim]

Currently, one of my players has a set of goggles that lets him see if a creature is alive, undead, or a construct.
The group encountered a cow that was possessed by an incorporeal extra-planar creature, so since it has no body of it's own it's lifeforce should overlap the cow's. So, I told the player he saw two lifeforces in the cow. Fortunatly, he assumed the cow was pregnant.

I would have answered "alive".