Ring worn by warriors of the sand kingdom, Carthus.
Boosts rolling invincibility, at the cost of defense.
The sword technique of Carthus allows for fluid movement with a curved sword. Masters of the technique are said to dazzle their opponents by moving as weightlessly as a grain of sand.
They live for their High Lord Wolnir, conqueror of most kingdoms known to their people.
Boosts rolling invincibility. Reduces absorption against every type of physical damage by roughly 10.
In terms of invincibility frames, you normally have 28 frames of invincibility with 18 frames of recovery at 60 FPS, which is 14/9 at 30 FPS.
With the ring, you have 38 frames of invincibility with 8 frames of recovery at 60 FPS, which is 19/4 at 30 FPS.
Catacombs of Carthus treasure:
On an altar at the end of the hallway just after the Catacombs of Carthus bonfire.
Head left from the Catacombs of Carthus bonfire, then take the path to the right where you will find a large number of Writhing Rotten Flesh and several Skeleton Wheels. The ring is on a corpse at the end of this path.