any type of invisibility will work. However, being "partially visible" with Improved Invisibility will not. With II, you must not be able to be seen, not just be untargetable by spells. Note that backstabs can only be done with one-handed bladed weapons usable by thieves. Thus, a thief with Use Any Item cannot backstab with Carsomyr, and Fighter/thieves cannot backstab with the Storm Star (you CAN backstab with the Staff Mace, though... the only option for thief/cleric backstabs)
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Yar!
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