Ment
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It's not a big deal; only the 4th level of the racial skill will be removed. The artifact can remain in the inventory. The main thing is to prevent its repeated use. Selling it can also be allowed, as long as the ultimate ability is reset at the same time.
Hmm, perhaps it's simpler to make the amulet "disappear" when the ultimate ability is used (i.e., destroy the amulet), if it's possible to preserve the racial skill at level 4 using scripts.
Oh well, I've forgotten the scripts.