Another Puzzle

Entering the stone building, Angus and Jayna found an altar with few items in the middle of the empty stone building. Based on the item's aura, they found it should be an artifact.

An artifact is a very rare item with many kinds of effects. So, getting one means getting a huge jackpot. But they managed to get a few at once after their first search.

Would that mean they will get more if they managed to harvest all the stone buildings? Now, both of them feel relieved that their hard work during the past hours is not useless.

As Angus's deduction is correct, both of them immediately take whole artifacts before going to another house that the clock arm pointed at.

During the way, Angus realized that the highest grade monster movement set in a pattern and occasionally stopped for a certain time. Then, they moved back to their previous spot before coming back again later after stopping.