Exchange Shop
Exchange Shop
Exchange Shop has old Part 1 equipment that can be exchanged using Weapon Resonance and Stigma Resonance.

How to Get Resonance
Weapon Resonance
Weapon Resonance used to be a common currency in Part 1 - you can get Weapon Resonance by converting Part 1 gacha weapons, and you can easily get weapons from Part 1 gacha.
This is not the case anymore, since Part 2 supplies do not give Part 1 gacha weapons.
So, how do you get Weapon Resonance now? You can forge ‘Bounty Weapons’ in Foundry, and convert them to Weapon Resonance. Out of all the Bounty Weapons, 3rd Sacred Relic has the lowest Honkai Piece cost.

Stigma Resonance
You get Stigma Resonance weekly from Open World. As a new player, you also get an abundance of them from starter event, but once that is over, you will only get a limited amount every week, so don’t waste them.
Weapon
Oath of Judah
Oath of Judah is a Divine Key weapon - it can be tuned in Divine Key Concierge to grant global ATK and Lightning DMG buff. If you already have Salvation of Sakura tuned in, Oath of Judah can still give global +10 ATK.

Stigma
Stigma in this category are still used by Part 1 valkyries, mostly in Memorial Arena mode.
Turgenev TB
Turgenev TB is a universal Elemental support stigma that can be used by any support. It is still used by Golden Diva in certain cases, and still used by a lot of valks in Memorial Arena mode.

Mei Beach M and Newton B
These two stigma are stigmas that apply short but powerful debuff. They are commonly used for SS-rank Arena bosses. Veteran players have multiple copies of these stigma.

Tesla Band TM
- Tesla Band T: Physical Support, sometimes used in Arena.
- Tesla Band M: Lightning Support, sometimes used in Arena.

Jin Shengtan TM
Jin Shengtan (JST) TM is a universal Elemental support stigma, like a weaker version of Turgenev TB, but - JST and Turgenev are commonly paired together on the two supports in Arena.

Schrodinger M
Schrodinger M can reduce Ult cd. Herrscher of Origin sometimes use Schrodinger M in Arena - and very situationally in Abyss.

Forge Materials
Stigma in this category are just decent, but they are used to forge G4 stigma, which are the best stigma for certain Part 1 valkyries, and general second best options for other Part 1 valkyries.
Goemon
Material for G4 Handel set, which is used by Herrscher of Thunder, Golden Diva, and a great option for other Part 1 Lightning DPS.

Leeuwenhoek
Material for G4 Little Joys set, which is used by Sirin, Dea Anchora, and a great option for other Part 1 Fire DPS.

Others
Equipment in this category are the signature set for outdated Part 1 valkyries. There’s no urgency to get these. Please read the valk’s guide page to learn more about the valk before you decide to spend your resources on these equipment.

Midnight Absinthe Equipment

Miss Pink Elf Equipment.

Herrscher of Flamescion Equipment

Fischl Equipment. Zhenyi can be used by other Part 1 Lightning DPS.

Starchasm Nyx Equipment

Herrscher of Sentience Old Equipment

Bright Knight Equipment

Twilight Paladin Equipment

Azure Empyrea Equipment

Stygian Nymph Equipment
MARISA