I remember that the spider was the main baddie, and there was a guy and girl. I remember a scene which they tried to get a shield out of a cave, the sunlight came in and reflected off the shield, and on to the wall and while standing in the reflected light, the shadows of people would and fight him and he had to fight the shadows. While he did that, the girl walks around and figures to cover the shield up to stop it. They take the shield and use it to fight the giant tarantula.

Ator the Fighting Eagle:  A Jabootu Nugget ?

That is it!