Docent

From Eberron: Rising From the Last War, page 276.

Description
Wondrous item, rare (requires attunement by a Warforged).

A docent is a small metal sphere, approximately 2 inches across, studded with dragonshards. To attune to a docent, you must embed the item somewhere on your body, such as your chest or your eye socket.

Sentience. A docent is a sentient item of any alignment with an Intelligence of 16, a Wisdom of 14, and a Charisma score of 14. It perceives the world through your senses. It communicates telepathically with you and can speak, read, and understand any language it knows (see below).

Life Support. Whenever you end your turn with 0 hit points, the docent can make a Wisdom (Medicine) check with a +6 bonus. If this check succeeds, the docent stabilizes you.

Personality. A docent is designed to advise and assist the warforged it's attached to. One of the simple functions of a docent is to serve as a translator. The docent's properties are under its control, and if you have a bad relationship with your docent, it might refuse to assist you.

A docent has the following random properties:
 * Languages. The docent knows Common, Giant, and 1d4 additional languages chosen by the DM. If a docent knows fewer than six languages, it can learn a new language after it hears or reads the language through your senses.
 * Skills. The docent has a +7 bonus to one of the following skills (roll a d4): (1) Arcana, (2) History, (3) Investigation, or (4) Nature.
 * Spells. The docent knows one of the following spells and can cast it at will, requiring no components (roll a d6): (1-2) Detect Evil and Good or (3-6) Detect Magic.
 * The docent decides when to cast the spell.

Wayfinder's Guide to Eberron
Consult your DM before using this version. It is usually considered unofficial and invalid due to updated material.

Wondrous item, rare (requires attunement).

A docent is a small metal sphere, approximately 2 inches across, studded with dragonshards. Despite a strong magical aura, it has no obvious abilities. If you're a warforged, you can attune to the docent, at which point the sphere becomes embedded in your chest and comes to life — literally.

A docent is an intelligent magic item designed to advise and assist the warforged it's attached to. A typical docent has an Intelligence score of 16 and Wisdom and Charisma scores of 14. Once you're attuned to the docent, it can communicate with you telepathically and can perceive the world through your senses. One of the simple functions of a docent is to serve as a translator. All docents understand Common and Giant, but a docent knows up to four additional languages. Elven and Draconic are common options. If a docent knows less than six languages in total, it can add new languages to its repertoire after encountering them. So a docent found in Xen'drik may have never encountered a dwarf before... but after spending some time in Khorvaire studying dwarves, it could pick up the Dwarven language.

In addition, a docent possesses up to three of the following traits.
 * Can cast Detect Magic at will
 * Can cast Detect Evil and Good at will
 * Can detect any form of divination or scrying targeting the warforged host.
 * Intelligence (Arcana) +7
 * Intelligence (History) +7
 * Intelligence (Investigation) +7
 * Intelligence (Nature) +7
 * Wisdom (Insight) +6
 * Wisdom (Perception) +6
 * The docent can make Wisdom (Medicine) checks targeting its warforged host, with a +7 bonus. If the host is rendered unconscious, the docent will automatically attempt to stabilize them once each turn.

You can use a bonus action on your turn to request that the docent use one of its traits on your behalf. In the case of skills, this uses the docent's bonus; your abilities and proficiencies have no effect on the outcome. These traits are under the control of the docent, and if you have a bad relationship with your docent it may refuse to assist you... or simply lie about information that it obtains. However, if you treat your docent well it could serve as a useful ally.

The origin of docents is a great mystery. House Cannith created the first warforged thirty years ago. But the docents come from the distant land of Xen'drik and appear to be thousands of years old. Were they created to interface with some other form of construct? Or are the modern warforged a new interpretation of an ancient design? The docents claim to have forgotten their creators... but this is a mystery waiting to be unraveled. While all docents come from Xen'drik, some have been brought to Khorvaire by explorers and it's possible to encounter them in the Five Nations.