The Artificer's Magic Item Savant feature (E:RftLW, p. 58; WGtE, p. 180) states:
[...] You ignore all class, race, spell, and level requirements on attuning to or using magic items.
Class and race requirements are relatively intuitive, additionally, since an Artificer is able to cast spells they can already attune to items that require you to be a spellcaster. But there's still some questions:
- Can they use a spell scroll of a spell not on their spell list? Is this one of the four requirements ignored?
- What are level and spell requirements; what are some examples?