Impurity — Bloodborne

Effects by tier and acquisition

Effects · conditions and stacking (wiki)

To obtain the Impurity rune you'll need to travel to the Forbidden Woods Lamp and enter the small windmill building nearby, where Valtr, Master of the League now resides. Once there, speak with him and agree to join the League to receive the rune. Equipping the rune has the added benefit of giving you an extra 2% HP during any coop session, but the main reason to equip it is so that you're identified as a Confederate of the League during coop and as such successful co-op session when this oath rune is equipped will reward you with vermin which can be crushed for ranking up at League's leaderboard. Testing HP boost effect : Cooping within the Blood Level range in the main game and Chalice Dungeons with 50 VIT (1500 HP), during coop you have 1050 HP without and 1071 HP with Impurity oath rune equipped, it is exactly 2% boost of max HP during cooperation. Impurity has no effect on the HP when you get summoned into the Chalice Dungeon with Cursed rite, during the testing both cases with and without the rune had the same value of 750 HP. With patch v1.07 a wide variety of new and existing NPCs have been added to the main game, the Old Hunters areas and the Chalice Dungeons to aid you during the hunt, particularly during boss fights. The conditions for summoning these allies vary; the “ Old Hunter Bell ” is a universal requirement for calling any of them, but you must also equip the " Impurity " rune in order to summon League Confederates. In certain cases you must begin or complete specific quests before summoning a particular character, such as Henryk and Valtr ; in others you will lose your opportunity to summon the NPCs in question if you've already killed them, such as the younger Madaras twin . In some areas you may be able to summon up to two NPC Hunters. List of Confederate Old Hunter Summons ► Old Hunter Henryk Forbidden Woods , Byrgenwerth ► Younger Madaras Twin Forbidden Woods , Byrgenwerth , Hunter's Nightmare ► Yamamura the Wanderer Old Yharnam , Yahar'gul, Unseen Village , Research Hall ► Valtr, Master of the League Hunter's Nightmare

Acquisition · detailed conditions (wiki)

Acquired from (Main Story) : Valtr, Master of the League in Forbidden Woods next to Forbidden Woods lamp [Night / Blood Moon]. Swear an oath to the League

Effects by tier and acquisition

Effects · conditions and stacking (wiki)

To obtain the Impurity rune you'll need to travel to the Forbidden Woods Lamp and enter the small windmill building nearby, where Valtr, Master of the League now resides. Once there, speak with him and agree to join the League to receive the rune. Equipping the rune has the added benefit of giving you an extra 2% HP during any coop session, but the main reason to equip it is so that you're identified as a Confederate of the League during coop and as such successful co-op session when this oath rune is equipped will reward you with vermin which can be crushed for ranking up at League's leaderboard. Testing HP boost effect : Cooping within the Blood Level range in the main game and Chalice Dungeons with 50 VIT (1500 HP), during coop you have 1050 HP without and 1071 HP with Impurity oath rune equipped, it is exactly 2% boost of max HP during cooperation. Impurity has no effect on the HP when you get summoned into the Chalice Dungeon with Cursed rite, during the testing both cases with and without the rune had the same value of 750 HP. With patch v1.07 a wide variety of new and existing NPCs have been added to the main game, the Old Hunters areas and the Chalice Dungeons to aid you during the hunt, particularly during boss fights. The conditions for summoning these allies vary; the “ Old Hunter Bell ” is a universal requirement for calling any of them, but you must also equip the " Impurity " rune in order to summon League Confederates. In certain cases you must begin or complete specific quests before summoning a particular character, such as Henryk and Valtr ; in others you will lose your opportunity to summon the NPCs in question if you've already killed them, such as the younger Madaras twin . In some areas you may be able to summon up to two NPC Hunters. List of Confederate Old Hunter Summons ► Old Hunter Henryk Forbidden Woods , Byrgenwerth ► Younger Madaras Twin Forbidden Woods , Byrgenwerth , Hunter's Nightmare ► Yamamura the Wanderer Old Yharnam , Yahar'gul, Unseen Village , Research Hall ► Valtr, Master of the League Hunter's Nightmare

Acquisition · detailed conditions (wiki)

Acquired from (Main Story) : Valtr, Master of the League in Forbidden Woods next to Forbidden Woods lamp [Night / Blood Moon]. Swear an oath to the League