Not A Bug Can't use item as a shield

Item Mardigor's Frosty Tablet states in the lore "Frozen solid, so it can be used as a buckler". I can confirm, you can't. Its range only, and does not offer "Secondary slot" usage.

That's not a bug, it's called flavor text. It's like a nice description that gives the item a story.

GNOMEPOWER has the idea, but my question is did you mean Margidor's Frosty Tablet?

That drops off of Margidor who is a named skeleton in an icy zone. He mostly likely made it frozen so he could use it as a buckler to stave off adventures such as your self.

Yeah,

Yes, I misspelled it.