The enchantment level or "plus factor" for a weapon, which determines what it can hit, is not always the same as the THAC0/damage bonus. For example the Flametongue has an enchantment level of +4 though its bonus is +1 vs. most enemies, whilst the Daystar has an enchantment level of +2 despite being +4 vs. undead and evil enemies. (That's why it can't hit really powerful vampires)
You can find out information like this with Infinity Explorer, it's very useful when editing/creating items or just finding out how the Infinity Engine and game rules work.
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