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Firbolgs have the Firbolg Magic trait (VGtM, p. 107):
You can cast detect magic and disguise self with this trait, using Wisdom as your spell casting ability for them. Once you cast either spell, you can't cast it again with this trait until you finish a short or long rest.
Does Firbolg Magic have one use that's expended when either spell is cast? Or does it have two uses, where each spell can be cast once?
They can cast each spell once per day, so two spells in total. The trick is in the wording:
Once you cast either spell, you can't cast it again with this trait until you finish a short or long rest.
Since "either" means "The one or the other" and "it" means "the one previously mentioned" the ability essentially reads:
Once you cast one of these spells, you can't cast that spell again with this trait until you finish a short or long rest.
(But honestly, the wording on this trait is rather confusing to me as well. Might be one these cases where my 'not a native English speaker' shines through.)
