Protects against proton and is hard to destroy with other elements. post id in comments if you get past :)
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i have now added the shield you suggested. thanks :)
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and a piston drill goes past it with ease (add powered shield to jam the drills, use it on one of the outer layers for max efficiency against drills)
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a (propper) proton laser, like the stamp i have, burns through it in a matter of seconds, the insulator takes a short while though ;)