Just as it is in, the magic items in are organized into rarity levels to designate their strength, ranging from uncommon, to rare, to very rare, all the way up to legendary. Generally, an item's usefulness can be determined by comparing its rarity to another of the same type; for instance, a +2 rare longsword is a straightforward upgrade to a +1 uncommon variant.
But there are quite a few items for which that is not the case – items that work particularly well with a specific build or are otherwise strong enough to overshadow even those of higher rarities. These uncommon magic items are more powerful than their rarity gives them credit for, and hold up even against higher-level items of the same type.
Found in the githyanki crèche during Act One, the Strange Conduit Ring is a good option for those that combine martial and magical might. It adds 1d4 psychic damage to the weapon attacks the wearer makes, as long as they are maintaining concentration on a spell while they do so. Warlocks can combine this with or rangers with to devastating effect, and eldritch knights and swords bards can get even more out of it, since they make more attacks per turn.
The Caustic Band is one of several items that have had their rarity changed since the initial release of the game. This ring used to be uncommon, but it's no longer.
It compares most directly to something like the Caustic Band, which adds two points of acid damage to weapon attacks. The Band is categorized as very rare, thoughthe damage potential of the Strange Conduit Ring is technically greater, at the cost of requiring concentration. And generally, psychic damage is considered more useful than acid, given there are fewer creatures resistant to it. In the hands of the right character, this ring can be strong right up to the end of the game.
Many of these powerful uncommon items rely on status effects and powers which only exist in, and the Hat of Fire Acuity is a great example of how these items work. This piece of
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