Fritter the 7-Legged Spider

Mount
The Kernel insists that this tarantula of unusual size is house-trained. Fritter wears a harness made of definitely-not-humanoid-teeth-how-dare-you and woven spiderwebs. Fritter uses the giant spider stat block with the following changes:
• For your own safety, Fritter’s poison glands have been removed. Their bite does not deal poison damage.
•Fritter has an intense fear of heights. You must succeed a DC 15 Wisdom (Animal Handling) check to convince Fritter to use their spider climb ability.

If killed, Fritter can be summoned via find steed, find greater steed, or phantom steed.

This shield appears as the head of a large beer keg, ringed by a rusty iron band. Whenever the shield is struck by a blow, a chorus of cheering dwarven voices are heard.

While holding this shield, you can speak its command word as a bonus action to cause it to animate. The shield leaps into the air and hovers in your space to protect you as if you were wielding it, leaving your hands free. The shield remains animated for 1 minute, until you use bonus action to end this effect, or until you are incapacitated or die, at which point the shield falls to the ground or into your hand if you have one free.

A tiny, incandescent blue sphere easily mistaken for a magic gemstone

This steel shield is embossed with a longsword wrapped in thorny vines which end in roses in full bloom. The enamel coloring the roses is still vibrant.

Iron spikes protrude from the wooden shield's edges, and a cracked orc skull is painted in black on its outer surface. A legend lore spell reveals that the shield was crafted for Nimoar, a legendary human warlord who died in 936 DR. After his death, the shield disappeared from Nimoar's Hold, a fortress that stood where Castle Waterdeep stands today.

Special features:

Origin: [[4]] Human. Created by Human crafters of the Nelanther Isles and enchanted by SEER herself.

History: [[6]] Arcane. The Axe has subtle design motifs indicating the Axe was intended for use by a member of the Lord's Alliance specializing in fighting spellcasters.
Minor Property: [[15]] Unbreakable. The axe can't be broken, except by special means.
Quirk: [[2]] Confident. Carrying this Axe helps the bearer feel self-assured.

You can use an action to blow this horn. In response, 3d4+3 warrior spirits from the Abyss appear within 60 feet of you. They look like Minotaurs and use the statistics of a berserker. They return to the Abyss 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.

If you blow the horn without having proficiency with all simple weapons, the summoned berserkers attack you. If you meet the requirement, they are friendly to you and your companions and follow your commands.

https://www.dndbeyond.com/magic-items/333415-horn-of-the-endless-maze

Armor (breastplate), rare (requires attunement) This breastplate is made of chardalyn reinforced with hardened wood and boiled leather. While wearing it, you always feel bitterly cold. You have resistance to necrotic damage while you wear this armor.

Tucked in a sheath strapped to Skella’s right boot is a dagger of blindsight. The magic dagger was stolen from the hobgoblin warlord Azrok on level 3. This rare magic item requires attunement. A creature attuned to it gains blindsight out to a range of 30 feet.
The dagger has a saw-toothed edge and a black pearl nested in its pommel.

There is nothing remarkable about the copper throne or helm, and neither object detects as magical. But if a character wears the helm while sitting on the throne, a tube-shaped compartment in the ceiling above opens and a wand of secrets falls out onto the character’s head (which the helm conveniently protects).

You have a swimming speed of 40 feet while wearing this white gold ring engraved with images of waves and fish.

Elemental Gem, Emerald
DMG, p167
Wondrous item, uncommon
Minor tier

This gem contains a mote of elemental energy. When you use an action to break the gem, a water elemental is summoned as if you had cast the conjure elemental spell, and the gem's magic is lost.

It is said the hobgoblin hero Aark the Bloody slew one hundred trolls with this sword. To this day, it begins to ooze blood when it is drawn and does not cease until sheathed.

Food and other perishable items do not age or decay while inside it. The chest is 2½ feet long, 1½ feet wide, and 1 foot tall with a half-barrel lid. It weighs 25 pounds. Muiral carries the key that unlocks this chest. The lock can be picked with thieves' tools and a successful DC 15 Dexterity check. Smashing the lock or any other part of the chest renders it nonmagical.