Shard

During the war between the Paragon and the Dissident, the Dissident was actually able to get the upper hand and shatter the Paragon's weapon. Shards of it rained down on the material plane, scattered across the entirety of Tebrith. They are shards of an unknown metal which cannot be melted even with the hottest of dragon's breath, nor given a single dent by any sort of tool or weapon, and has a mirror, iridescent golden finish that is impossible to damage.

There are six known shards, one corresponding to each of the Foremost. The rest were too small to be of consequence.

Locations that have a shard have a somewhat stronger magical aura than surrounding regions, including whole towns of magic-users who are unaware that it is unusual.

When a shard is implanted into a tool or weapon, it significantly strengthens both the weapon and the user, though it actually has a similar effect to the Winterthorn: it awakens the Paragon and causes them to attempt to break your mind and possess you. Though unlike with the full power of the Winterthorn, you are capable of resisting it, though it becomes harder the more you use the tool/weapon.

The six that are known are kept memorised by this phrase:

One who laughs,

One who Weeps.

One who fled,

One who keeps.

One in frost,

One in deep.

These correspond to their locations: the first is kept by Durbegar the Enamoured. It was given to her by Vewin. The second is in the Weeping Willow tree in Sunvalley, which is immortalised by an engraving stating "One Who Weeps", guarded by Yannick the Steady and placed there by Kiara. The third is kept by the elder of the Firbolgs of Berrespool Expanse, and actually refers to Fezzik/Wysayra, though they don't actually get it until later. It's protected by Adsatra the Protector, and it was given to them by Brylynne. The fourth is kept by a Werebear, named Olivia the Giving, who lives in the Brylynne's Labrinth forest, given to him by The Serene. The fifth is in the Sauris Hinterlands, in the tiefling village. It's protected by Andmeros The Creator, and was placed there by Sabraeleous. The last is kept in the entrance to the Underdark, under Hjaldar, by an ancient, wizened Duergar, named Ragren the Vigilant, who uses it to protect the portal to the Underdark, as he cannot enter while he holds it.