Weapon of Earth - Pentacle, How to construct the earth pentacle Options

I'm building an earth pentacle to use in my rituals, but i have some doubts on its creation.

I'm building it around 6 inches, out of some wood boards i glued together.

I read in "Modern Magick" by "Kraig" that it is better to be concave, because this would direct the energy directly back to the one who sent it, in case of an attack.

I really don't agree to that, as i don't see how anything reflects back to its origin on something concave differently from something flat. I also don't understand why it has to be used against attacks, as it is obviously meant as a defensive weapon, or a shield. And a shield is definitely not concave, more the opposite.
It just doesn't add up, Kraig's theory, and it leaves me confused...

Could anyone give me some advise on this.
Also, the origin of the god names that are meant to go around it are not given in Kraig's book, I would like to know them to. (IMG:style_emoticons/default/huh.gif)

i kindly thank you for apreciating my handy work.

It is true that the goal is to work without tools. But the making of the tools is an important project. The time you spend gathering the utils, researching the pentacle. And eventually pouring your creativity into it while making it, are the most rewarding. Trough it the tool is given a lot of power to.

I would never buy a tool, for these reasons. The journey is something you miss when buying a tool. Unless you are on a journey while buying it.

I made a fire wand too, went into the woods in the dark to gather the wood for that. It was a good experience, out there in the dark, realy magical.

I can only promote these experiences to all!!!