Its effect does stack with the Dark Wood Grain Ring, allowing the player to 'Ninja Flip' in swamp or other mobility-restricting terrain. It is also helpful in Sen's Fortress, for fighting the Titanite Demons in the pit under the first bridge. The item is clearly visible near the ladder down to the bonfire before Nito (you dont need to get on the pillar, just spam Q.
It will come in handy again during the fights with the Hydras, as well as traversing the pits of Lost Izalith. Effect: Gives 2 attunement slots and increases miracle effectivenes (only affects miracles with 'numbers', such as Heal or Wrath of the Gods doesnt effect Miracles such as Force or Seek Guidance) Location: In the Tomb of Giants you have to drop down multiple times. The ring is useful for going through Blighttown, as increased movement through the swamp decreases the likelihood of contracting Poison. Allows full movement regardless of environment.The Rusted Iron Ring can be found on the crumbled stairway, just past the door that is opened with the Undead Asylum F2 West Key in the upper level of the Undead Asylum.Those who find this strange ring to their liking will be pleased to find it easier to gain footing on poor ground such as swamps.' It is terribly rusted, and faintly stained with blood.
' This iron ring was used to shackle the guilty.
Rusted Iron Ring is a Ring in Dark Souls and Dark Souls Remastered