Magic Items

You have a +1 bonus to attack and damage rolls made with this weapon.

Silver Horn Of Valhalla
Wondrous item, rarity varies

Wondrous Item, rare You can use an action to blow this horn. In response, 2d4 + 2 warrior spirits from the plane of Ysgard appear within 60 feet of you. These spirits use the berserker statistics from the Monster Manual. They return to Ysgard after 1 hour or when they drop to 0 hit points. Once you use the horn, it can’t be used again until 7 days have passed.
A silvered, hollow tusk carved with bestial images and stained in the blood of countless battles, the horn impels its user to kill foes with their bare hands while the taste of congealed blood fills their mouth. The berserkers called forth are bloodthirsty warriors tainted by Malar

If you blow the horn without meeting its requirement, the summoned berserkers attack you. If you meet the requirement, they are friendly to you and your companions and follow your commands.

The Mind Fortress (Ring of Mind Shielding)
Wondrous item, uncommon, table C

Ring, uncommon (requires attunement)

While wearing this ring, you are immune to magic that allows other creatures to read your thoughts, determine whether you are lying, know your Alignment, or know your Creature Type. Creatures can telepathically communicate with you only if you allow it.

You can use an action to cause the ring to become Invisible until you use another action to make it visible, until you remove the ring, or until you die.

If you die while wearing the ring, your soul enters it, unless it already houses a soul. You can remain in the ring or depart for The Afterlife. As long as your soul is in the ring, you can telepathically communicate with any creature wearing it. A wearer can’t prevent this Telepathic Communication.

Flavour:

The Mind Fortress is the remnants of an extradimensional location that served as the site of a ritual enacted by the alchemist Ravinan. Ravinan divided three aspects of his psyche, in an attempt to purify his soul, and collapsed this evil into a stone called the Eye of Darkness. The Mind Fortress then served as the extradimensional home for the stone until liberated by adventurers. After the stone was removed, the Mind Fortress shrank to a less-potent but still useful magical item.

The Mind Fortress functions in all ways as a ring of mind shielding. The Mind Fortress still contains two portions of Rhys’s psyche (his center for rational thought, as well as his conscience). These mental remnants do not count as an actual soul for purposes of the ring, nor do they cause the Mind Fortress to act as an intelligent item.

However, a DM might choose to have these aspects of Rhys’s psyche may affect the emotional state of the wearer or interact with the wearer during a dream or trance state. The Mind Fortress’s form is still highly mutable. The item periodically and randomly alters its appearance in slight ways. The bearer has no control over these minor alterations, which have no effect on the item’s use.This item can be found in the Dungeon Master’s Guide.

Tome of Understanding
Wondrous item, very rare
This book contains intuition and insight exercises, and its words are charged with magic. If you spend 48 hours over a period of 6 days or fewer studying the book's contents and practicing its guidelines, your Wisdom score increases by 2, as does your maximum for that score. The manual then loses its magic, but regains it in a century.

Unearthed Ring of Mind Shielding
Ring, uncommon (requires attunement)
While wearing this ring, you are immune to magic that allows other creatures to read your thoughts, determine whether you are lying, know your alignment, or know your creature type. Creatures can telepathically communicate with you only if you allow it.

You can use an action to cause the ring to become invisible until you use another action to make it visible, until you remove the ring, or until you die.

If you die while wearing the ring, your soul enters it, unless it already houses a soul. You can remain in the ring or depart for the afterlife. As long as your soul is in the ring, you can telepathically communicate with any creature wearing it. A wearer can't prevent this telepathic communication.

This ring is set with a perfectly round off-white stone. The stone’s natural veins resemble the mountains of the moon. When within 120ft of an aberration, the ring glows softly