Your dagger is probably Penumbra's dagger, keep it, it's part of a quest.

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this one?

The amulet: Does it have the initials C.B. on it and was near a skeleton in the Rivertown East area? Sell it, just an easteregg (a joke, referring to Drizzt's best friend C.B. Drizzt was a drow elf in Salvatore's fantasy books, maybe you know this name from the Baldur's Gate series?)

An item can only lower/raise something if it has stats. So, I'd check if you have a cursed item in your equipment, for instance a ring?
Kiya

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