An electric shield
A Hoplon without the bronze sheet. The inside of shield is covered in rubber. The wooden shell has a metal star which is charged and shocks anything it touches. it is powered by a small micro nuclear core which is right under the middle strap.
When this is used in the front line of a Phalanx... when the enemy hits them. They are either dead or cant move. In real combat it can be very effective when smashing.
It was just a random idea that popped into the mind of the creator of GAO