Does anyone know what these artifacts are (see screenshot) and where they can be found? Thank you in advance! I only know that there is a Moon Temple Cloak and a Priest's Mantle of the Cult of Baa here.

These items are obtained by killing dragons (preferably red or green) using the save/take/not-take/reload method.
They drop with the names Artifact/Relic.
There are approximately 30-35 of them in total. Relics are of three types:
- neutral (available for immediate use)
- tailored for light/darkness (available after choosing a path) - for example, the Mace of the Light Priest in the picture.
The practical meaning is to start a new game with the intention of eliminating and tediously killing a dragon on Emerald Island for a long time, as the artifacts are good for a weak party.