Blood Codes in Code Vein 2 are essentially a hot-swappable class system, allowing recustomization of characters without having to fully respec them in order to accomplish that. All other character customizations hinge on Blood Codes, including usable Weapons and associated Formae.
This Code Vein 2 guide is a listing of all 57 Blood Codes as well as where and how to acquire and upgrade them over multiple playthroughs.
Acedia Bloodline Blood Codes
Acedia Bloodline: Jadwiga 1
Recruit and select Jadwiga as a partner.
Acedia Bloodline: Jadwiga 2
Maximize proficiency in Acedia Bloodline: Jadwiga 1 and speak with Jadwiga at the MagMell Institute.
Acedia Bloodline: Jadwiga 3
Maximize proficiency in Acedia Bloodline: Jadwiga 2, defeat Zenon Gryfgote, and speak with Jadwiga.
Acedia Bloodline: Zenon 1
Recruit and select Zenon during Slay The Hero Zenon quest.
Acedia Bloodline: Zenon 2
Maximize proficiency in Acedia Bloodline: Zenon 1 and speak with Zenon Gryfgote after recruiting him in the 2207: Upheaval Era.
Hero Zenon Blood Code
Defeat Hero Zenon at the Solitary Refinement Cell in the Insula Carcere in the 2277 timeline era.
Caritas Bloodline Blood Codes
Guardian’s Heart Blood Code
Acquired from Lou MagMell in 2177 during the quest to save Noah.
Gula Bloodline Blood Codes
Gula Bloodline: Josee 1
Save Josee Anjou in her outpost in 2179: The Hero Josee’s Era.
Gula Bloodline: Josee 2
Maximize proficiency in Gula Bloodline: Josee 1 and speak with Josee Anjou at a Mistle.
Gula Bloodline: Josee 3
Maximize proficiency in Gula Bloodline: Josee 2 and speak with Josee Anjou at a Mistle.
Gula Bloodline: Josee 4
Maximize proficiency in Gula Bloodline: Josee 3, then recruit and select Josee Anjou during the Upheaval Era.
Gula Bloodline: Josee Blind
Missable. Recruit and select Josee Blind during the Upheaval Era, but only if you avoided saving Josee previously.
Gula Bloodline: Lise 1
Recruit and select Lise Anjou after saving Josee Anjou and fulfilling her tasks. Also defeat the Corroded Scar Predator in the Sunken City, and the Wandering Specter in the Sunken City Aquarium.
Gula Bloodline: Lise 2
Maximize proficiency in Gula Bloodline: Lise 1 and speak with Lise Anjou at a Mistle.
Hero Josee Blood Code
Defeat Hero Josee at her outpost in the Sunken City in the 2277 timeline era.
Josee The Blind Hero Blood Code
Missable. Defeat Josee The Blind Hero at her outpost in the Sunken City in the 2277 timeline era.
Luxuria Bloodline Blood Codes
Hero Holly Blood Code
Defeat Hero Holly in the Sanatorium at the Undead Forest in the 2183 timeline era.
Hero Holly The Reaper Blood Code
Defeat Hero Holly The Reaper in the Withered Greenhouse at the Undead Forest in the 2277 timeline era.
Lost Camilo Blood Code
Defeat Camilo Asturias in the Sanatorium at the Undead Forest in the 2183 timeline era.
Luxuria Bloodline: Camilo
Get Camilo’s Pathos during Holly’s Timeline Shift Decision.
Luxuria Bloodline: Holly Condemned
Missable. Recruit and select Holly Condemned during the Upheaval Era, but only if you avoided saving Holly previously.
Luxuria Bloodline: Holly 1
Recruit and select Holly Asturias during the Slaying The Hero Holly quest.
Luxuria Bloodline: Holly 2
Maximize proficiency in Luxuria Bloodline: Holly 1 and speak with Holly Asturias at a Mistle.
Luxuria Bloodline: Holly 3
Maximize proficiency in Luxuria Bloodline: Holly 2, then recruit and select Holly Asturias during the Upheaval Era.
Luxuria Bloodline: Lycoris 1
Recruit and select Lycoris during the Slaying The Hero Holly quest.
Luxuria Bloodline: Lycoris 2
Maximize proficiency in Luxuria Bloodline: Lycoris 1 and speak with Lycoris at a Mistle.
Patientia Bloodline Blood Codes
Hero Lyle Blood Code
Defeat Hero Lyle in Pioneer Castle at Corroded Scar in the 2277 timeline era.
One-Armed Hero Lyle Blood Code
Defeat One-Armed Hero Lyle in Forward Base One at Corroded Scar in the 2277 timeline era.
Patientia Bloodline: Craig 1
Defeat Mutated Survivor Bernd during Slaying The Hero Josee quest.
Patientia Bloodline: Craig 2
Maximize proficiency in Luxuria Bloodline: Craig 1, fulfil Lyle’s requests, and speak with Craig McLeish at a Mistle.
Patientia Bloodline: Iris 1
Recruit and select Iris MagMell during the storyline.
Patientia Bloodline: Iris 2
Maximize proficiency in Patientia Bloodline: Iris 1 and speak with Iris MagMell at a Mistle.
Patientia Bloodline: Iris 3
Maximize proficiency in Patientia Bloodline: Iris 2 and speak with Iris MagMell at a Mistle, before defeating Hero Valentin.
Patientia Bloodline: Lyle Artificial Arm
Missable. Recruit and select Lyle Artificial Arm during the Upheaval Era, but only if you avoided saving Lyle previously.
Patientia Bloodline: Lyle 1
Meet Lyle and Craig in Forward Base Two after completing Follow The Chorus’ Trail in the 2178 timeline era.
Patientia Bloodline: Lyle 2
Maximize proficiency in Patientia Bloodline: Lyle 1 and speak with Lyle McLeish at a Mistle.
Patientia Bloodline: Lyle 3
Maximize proficiency in Patientia Bloodline: Lyle 2, then recruit and select Lyle McLeish during the Upheaval Era.
Pioneer Queen Imogen Blood Code
Defeat Pioneer Queen Imogen in the Sealed Great Mine at Corroded Scar in the 2182 timeline era.
Superbia Bloodline Blood Codes
Hero Valentin Blood Code
Defeat the Hero Valentin..
Resurgence Core Blood Code
Defeat the Resurgence Core. First, complete two endings: ‘A Hero’s End’ and ‘Luna Fraterna’, then opt to Rescue Lou and proceed until you arrive at the location of the boss.
Soul Savior Valentin Blood Code
Defeat Soul Savior Valentin atop the Sealing Spire in the Sealed Grounds, after completing one ending.
Superbia Bloodline: Frantz
Defeat Dejected Assailant at the Forma Storage Tower in the 2177 timeline era.
Superbia Bloodline: Lavinia 1
Meet Lavinia Voda during the storyline.
Superbia Bloodline: Lavinia 2
Maximize proficiency in Superbia Bloodline: Lavinia 2, defeat One-Armed Hero Lyle, and speak with Lavinia Voda at the MagMell Institute.
Superbia Bloodline: Lavinia 3
Maximize proficiency in Superbia Bloodline: Lavinia 3, reach Insula Carcere, and speak with Lavinia Voda at the MagMell Institute.
Superbia Bloodline: Lou 1
Unlocked by default.
Superbia Bloodline: Lou 2
Maximize proficiency in Superbia Bloodline: Lou 1, rescue Noah G Magmell, and speak with Lou MagMell at a Mistle in the present.
Superbia Bloodline: Lou 3
Maximize proficiency in Superbia Bloodline: Lou 2 and speak with Lou MagMell at a Mistle or at the MagMell Institute.
Superbia Bloodline: Lou 4
Maximize proficiency in Superbia Bloodline: Lou 3 and speak with Lou MagMell at a Mistle or at the MagMell Institute.
Superbia Bloodline: Lou 5
Maximize proficiency in Superbia Bloodline: Lou 4, then recruit and select Lou MagMell during the Upheaval Era.
Superbia Bloodline: Noah 1
Recruit and select Noah G Magmell during the storyline.
Superbia Bloodline: Noah 2
Maximize proficiency in Superbia Bloodline: Noah 1, save Noah at the Forma Storage Tower in the 2177 timeline era, and speak with Noah G MagMell at the MagMell Institute in the present.
Superbia Bloodline: Noah 3
Maximize proficiency in Superbia Bloodline: Noah 2 and speak with Noah G MagMell at the MagMell Institute.
Superbia Bloodline: Noah 4
Maximize proficiency in Superbia Bloodline: Noah 3, then recruit and select Noah G MagMell during the Upheaval Era.
Superbia Bloodline: Valentin 1
Defeat Josee The Blind Hero, then recruit and select Valentin Voda as a partner.
Superbia Bloodline: Valentin 2
Maximize proficiency in Superbia Bloodline: Valentin 1 and speak with Valentin Voda at a Mistle.
Superbia Bloodline: Valentin 3
Maximize proficiency in Superbia Bloodline: Valentin 2 and speak with Valentin Voda at a Mistle.
Those are all 57 Blood Codes in Code Vein 2 as well as how and where to unlock them.