Collect three Remnant Incense Guide - Fellfrost Peak from Fellfrost Peak and Volkodlak Tundra to unseal the Shadow Realm Treasure Vault at Fellfrost Peak in Genshin Impact. To find the Remnant Incense Guide - Fellfrost Peak, open the Precious and Luxurious chests in both areas. There are no specific locations for it, as it's a random drop that purely depends on RNG and your luck to find.
