When you get to the end area of the game when you have to choose to fight the dragon or not you need to attack it to start the sequence when you are on the dragon's back so he can take you to the arena
Once you are on its back you need to make your way to its heart
Then this is where you use the Empowered Godsbane Blade

Your character will then proceed to stab them self with the blade then you will get a secret cutscene/Ending path

Now that you have made it to the unmoorned world this is where you can find most if not all of the late game materials for weapon/armor upgrades

(skipable) You will notice that your main pawn is missing i would strongly suggest doing the quest. You get the quest when you first enter the unmoorned world i advise you to do this quest as this whole unmoorned world is pretty hard if you are under leveled (I do not recommend going here if you are under leveled) and its just good to have extra help as theres so many dragons and other big enemies

These are all the locations where you can find eldricite

When you are in one of the locations you should see a spectre they look like phantasm but dark purple
Go ahead and kill it and it should drop eldricite I suggest using an archer or any range vocation as they can be a little tricky to kill since they fly pretty high up and it wont be so annoying trying to kill them. But thats how you get eldricite, Hope this help anyone looking for eldricite.