Sourcestone Unknown.

Tier UT
On Equip +110 HP, +110 MP, +6 SPD
XP Bonus 7%
Soulbound Soulbound
Feed Power 1,000
Forging Cost 60 Legendary Material / 160 Rare Material / 180 Common Material / 1560 Forgefire / 2 Mark of the Void Entity
Dismantling Value 15 Legendary Material / 40 Rare Material / 45 Common Material

Loot Bag Assigned to White Bag
Drops From Void Entity
Voided Epic Quest Chest

Blueprint Sourcestone Blueprint
Drops From Void Entity
Obtained Through The Tinkerer (50x Ancient Schematic)

Please note “Unknown.” is the actual description of the item in-game.

This ring provides a fairly high HP and MP bonus along with a hefty SPD boost, making it a decent general-purpose ring. Rushers benefit from it the most due to its SPD and MP boosts helping the user get around quicker and its HP boost increasing survivability.

However, its lack of any offensive stats means that most players would rather wear a different general-purpose ring, such as the Forgotten Crown, Omnipotence Ring, or Exalted God’s Horn. If you don’t have access to those however, this ring remains a solid choice.

Wearing this ring with the rest of the Void Archer set enitrely negates the SPD penalties from the armor and quiver, and even gives the player a net increase of +1 SPD.

Before Lost Halls 2.0, the ring gave +80 HP, +80 MP, and +4 SPD.

Before Patch X.26.0.0 (May 2018) the Sourcestone had the following sprite:
Sourcestone (old)

Untiered Rings
SourcestoneUT. Sourcestone
Set Tiered Rings