Magic Items

Wondrous Item, Very Rare (Requires Attunement by a Creature That Can Speak Infernal)
This bulky, eyeless helmet is made for a pit fiend but magically resizes to fit the heads of other wearers.
While wearing the helm, you can see out of it as though you weren't wearing it. In addition, you know the exact location and type of all devils within 1,000 feet of you. You can telepathically communicate with a devil within range, or you can broadcast your thoughts to all devils within range. The devils receiving your broadcasted thoughts have no special means of replying to them.
The helm has 3 charges. As an action, you can expend 1 charge to cast Dominate Monster (save DC 21), which affects devils only. (The spell fails and the charge is wasted if you target any creature that's not a devil.) If a devil can see you when you cast this spell on it, the devil knows you tried to charm it. The helm regains all its charges 24 hours after its last charge is expended.
If you are not a devil, using the helm's dominate monster property in the Nine Hells has a 20 percent chance of attracting a narzugon, which arrives on the back of a nightmare mount in 1d4 hours. The narzugon tries to recover the helm, killing you if necessary to obtain it. If it gets the helm, the narzugon tries to deliver it to its infernal master.

This armor never gets dirty.
Half plate consists of shaped metal plates that cover most of the wearer's body. It does not include leg protection beyond simple greaves that are attached with leather straps.
This item can be found in Xanathar’s Guide to Everything.
Strange material: This plate armour is made of magically enchanted stone slabs, and there is no metal used enabling druids to wear it.

The storm giant quintessent Dessa imbued this belt with her elemental strength. When the belt’s fantastic strength is used lightning dances around the wearer while a warm desert wind blows in the area. While wearing this belt, your Strength score changes to a score granted by the belt (29). If your Strength is already equal to or greater than the belt's score, the item has no effect on you.

This hell-forged battle standard is made of infernal iron and fitted with a small, unopenable cage containing a quasit. The trapped quasit is incapacitated, and its cage has AC 19, 10 hit points, and immunity to all types of damage except force damage. If killed or somehow released, the quasit disappears in a cloud of smoke, and a new one appears in the cage, provided the cage is intact.
While you hold the banner, your weapon attacks and those of all allied creatures within 300 feet of you count as magical for the purposes of overcoming damage immunities and resistances.

Ticket to Ride. You’ve successfully completed the
task that Shirvasa the sommelier has set for you,
and in exchange he provides you with a voucher for
travel by gondola within the Abriymoch city limits.
Present it to any gondolier and not only do you ride
for free, but the devilish gondoliers treat you as one
of Shirvasa’s associates - only with more respect

Plate consists of shaped, interlocking metal plates to cover the entire body. A suit of plate includes gauntlets, heavy leather boots, a visored helmet, and thick layers of padding underneath the armor. Buckles and straps distribute the weight over the body.
Strange material: This plate armour is made of magically enchanted stone slabs, and there is no metal used enabling druids to wear it.