The Thief rogue's Use Magic Device feature says:
By 13th level, you have learned enough about the workings of magic that you can improvise the use of items even when they are not intended for you. You ignore all class, race and level requirements on the use of magic items.
This allows the rogue to attune to "sorcerer/wizard/warlock only" items. But is the restriction "requires attunement by a spellcaster" also covered by the trait?
The official "spellcaster restriction" is explained in the rules on attunement:
If the prerequisite is to be a spellcaster, a creature qualifies if fit can cast at least one spell using its traits or features, not using magic items or the like.
The problem I have with that is, that I think that by RAW, Use Magic Device does not let you use an item restricted to "spellcasters", but generally those items are supposed to be less restricted than other items which might be class exclusive. Or have I overlooked something?
Does the Thief rogue's Use Magic Device feature let them attune to items that require attunement by a spellcaster?
Best Answer
By RAW, no.
The Use Magic Device feature lists the specific attunement requirements that it circumvents, and, as the question states, "spellcaster" isn't one of them. There are other attunement requirements that Use Magic Device doesn't get around — for example, alignment restrictions exist for a Sword of Answering or a Talisman of Pure Good (or Evil).
If the intent was for Use Magic Device to get around all attunement restrictions, then it would say so; we can infer that the intent is that some such restrictions cannot be avoided.
It's possible that the intent of the designers was to allow rogues with Use Magic Device to be able to use the (mostly) wands with the 'spellcaster' restriction, but so far the wording of the rules doesn't support that.
But probably by RAI, yes.
In this Twitter post from October 2016, Jeremy Crawford was asked about how a Wand of Paralysis is used by a rogue, and he doesn't say that it can't be done. But the applicability of Use Magic Device to the spellcaster attunement requirement wasn't the subject of the question, either.
However, this doesn't seem to be a critical game balance issue, and given that Use Magic Device is intended to allow rogues to use spell scrolls, it doesn't seem unreasonable to extend it to the "spellcaster" items as well.