Vault of the Old Guard

From publisher blurb:

Vault of the Old Guard provides over 40 magic items of all rarities for your Fallen Camelot Campaign (though these items are easily usable in ANY setting). All items are tied to the Knights of the Round Table who owned them, include brief lore about the item and its owner, and and ranges from swords, boots, cloaks, rings, bows, and more.

Items include:

Mentor's Helm: allows an ally to reroll a missed attack role.
Bridging Spike: a magical pinion that makes scaling cliffs easy!
Fool's Scarf: grants immunity to advantage or disadvantage, at the risk of random teleportation.
The Last Stand: a sword that immediately heals you the first time you are reduced to 0 hit points.