Comrades Mооnst@r and Frozensoull attached the skull effect of the MapObject, but because of this, the skull moves, while the smoke from the eyes remains stationary.
I created a new AnimSet for the artifact, inserted a new animation into it that copies the animation from regular artifacts, and attached the smoke to it – ta-da! The smoke and glow are now attached to the eyes of the artifact.
I also created version 2 – in the game's resources, I found a special animation for the skull! The skull doesn't rotate and hangs quite high, almost at the top of the pillar of light; this was probably done so that the light wouldn't obscure the glow from the eye sockets.
Both mods are in one archive, their format is h5u (for the usermods folder). V1 – rotating skull, V2 – skull on top of the glowing pillar.