I'm replaying the first game now, and there are a few things that could be considered the artifacts that the writing on the wall has said are being restored.

The Stoneheng thingy was destroyed.

The lagoon was dammed up, possibly because it had magical properties

The rock that gets turned into a statue seems very out of place. It was quite possibly once a larger statue that had been broken apart.

There was burried treasure, which could contain artifacts burried to get trid of their power.