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How odd, I was able to imbue a Duellist Blade (Silan mission reward, Red Blades quest line) with a cold spell. Just used it to pull a Kipee. Perhaps this is a bug?

A bit of quick testing shows that the Ballast Axe, Duellist Blade and Fire and Wrath can be enchanted.  Each of them has an available sap load.  So can the refugee dagger and the refugee amp.

The various amplifiers (Frost Touch, Freezing Touch, and Icy Touch), have no sap load and cannot be enchanted.

General Rule: If a weapon has no sap load (i.e. equal 0) then it cannot be enchanted.

I suspect that Arfur will want to edit the post.

((Edited my post to correct an error.))