Vibroshield

Handcrafted by the akk gaurd these sheilds were probably made using medal from and ancient jedi spacecraft which would explain why metal eating funguses had no effect. a jedi craft would no doubt be made from a metal that was unable to be digested. they were also created using vibro motors which vibrated a way that made them immmune to lightsaber blows. Which also explains why Shogar Tok was able to fight shaak ti with his vibro axe although this is a completly unrelated topic. Mace windu said that the sheilds would eventually melt if he attack with his lightsaber so they were not complletly immune