With every new Genshin Impact update, we get new characters in the game, and to ascend them, we need to farm their ascension materials. One of them is the Emperor’s Resolution which is an ascension material required to ascend characters like Lyney, and it will become available in Genshin Impact 4.0 update to farm.
Their in-game description says, "The war hammer of the Emperor of Fire and Iron. The mighty crab has crushed countless foes with this giant claw." Since Fontaine will be the new region coming with the update, you will be able to find Emperor’s Resolution in it; however, it will be a difficult task to explore a massive region to farm them, and thus, here are their exact locations to save you a lot of time.
Genshin Impact: Emperor’s Resolution Farming Location
Emperor’s Resolution is a drop that you will get by beating Level 30+ Emperor of Fire and Iron, which is an "Armored Crablord that has survived for countless eons and surpassed almost all other Fontemer Aberrants."
Its Pyro-channeling twin molten horns that are located high up on its body can unleash vicious Elemental attacks and grants them even stronger defensive capabilities. In order to defeat it in an easier way, you will have to use Elemental Reactions to remove its Elemental Shield.
The location of Emperor of Fire and Iron has been marked on the map below; however, you won't be able to find it above the surface as it resides in an underwater cave. You can find the complete guide on reaching this boss' location along with the tips and best team composition to beat it here.
You will need a total of 46 Emperor’s Resolutions to ascend Lyney to his highest level, and once Emperor of Fire and Iron gets available in the game, you can unlock the nearest Teleport Waypoints or the Statue of Seven to travel to its location quickly.
In addition to this, make sure that your party characters have full HP before you go up against this beast.