I have listed detailed information on how to obtain souvenirs in the game in this guide.
How to get Souvenirs in Hades 2
To obtain these artefacts, you’ll need to offer an elixir to each deity. You can obtain elixir during your trials or from the merchant in exchange for bone splinters.
Nectar
You can obtain Nectar from the merchant after unlocking it from the cauldron.
You can also get some during your trials.
A: Silver Wheel
GIFT: HECATE
B: Kuckle Bones
Gift: Odysseus
C: Lucker Tooth
Gift: SCHELEMEUS
E: Evil Eye
GIFT: NEMESIS
K: Moon Beam
GIFT: SELENE
Q: Adamant Shard
GIFT: EPHAESTUS