Relic of the Eternals

[Dedo]

This relics have some use?

They are on Blackpits Cavern.

[Revolucas]

Do you mean "Eternal Artifact"? There is eternal plate there too that you might want to pick up, you can't see name when you highlight items but you can still pick it up.

These are craft ingredients for a very powerful armor piece: http://divinityoriginalsin2.wiki.fextralife.com/Armour+of+the+Eternals

Now if you are talking about the tablet you find, you need to read it to learn Swornbreaker recipe, and you can also give this tablet to Ryker to learn source point.