Lore

Usage

• Increases the level of Hollowing when you die. Hollowing is increased by the number of Dark Sigils you have, each death.
• It can be healed by giving a Fire Keeper Soul to the Fire Keeper, then exchanging souls to remove the curse. The cost of healing the Dark Sigil is equal to the cost to gain a number of levels equal to the amount of Dark Sigils in your possession. (including the incrementally higher cost of the higher levels), you will not lose any levels doing this.
• When the Dark Sigil is healed, all Dark Sigils are removed from your inventory, and your character will no longer gain more Hollowing on death. As of a recent patch, this also cures your current level of Hollowing.
• Once removed, your Dark Sigil will be removed and your character will no longer be affected by Hollowing.
• If you heal the Dark Sigil before getting 5 free levels from Yoel of Londor, he will no longer offer to "Draw out your true strength."
• Upon healing the Dark Sigil, Yuria of Londor will refuse to talk to you further (including purchasing items). Upon reloading Firelink Shrine, she will be gone. (not sure what else this changes, this occurred after healing the Dark Sigil immediately after killing Crystal Sage)
• Moving up to the next New Game will remove the Dark Sigil, but the Hollowing level will remain.

Acquisition

• Relationship gift.
• Acquired by letting Yoel of Londor draw out your true strength, granting you a free level. This can occur five times, it requires you to die twice before Yoel of Londor will offer it again, at hollowing level 0, 2, 6, 12, and 16.
• Given (×3) to you if you decide to marry Anri of Astora during the Lord of Hollows Questline.