New artifact with an invoke power of identification, which is interesting because it is useful in the early game and gets less important later on.

The base item type could be a blank spellbook or a scroll of identify (not a spellbook of identify, because then you just have the spell).

If implemented as a scroll, reading the scroll would either be special-cased not to disappear (possibly giving the same effect as invoking it, subject to the same invoke timeout), or it would give a powerful one-time identification effect such as a full inventory ID and then disappear.

Cursed or unlucky wishes for scrolls, potions, or spellbooks may give you the blank counterpart instead of what you wanted.

Artifact blank spellbook that guarantees success when writing in it and can be read infinitely without blanking. However, it can never be blanked or cancelled. Or possibly it generates as a random type of spellbook, and can only be blanked if not yet read.

Dipping a blank scroll or spellbook into a potion of gain ability turns it into some random scroll or spellbook. The beatitude of the resulting object uses the same formula as magic markers. Could also do this for wands of nothing, which become some random wand, without changing their charge count.