I'm currently developing a sci-fi concept for animation which partially involves a typical "the earth has been overrun by XYZ" scenario.
One of the ideas for XYZ we're thinking of is a species of intelligent crystalline beings made of diamond -- or at least a diamond like material. These are large, arachnoid in shape and fast. They kill by piercing their pray with sharp, lance-like protrusions on the ends of their forelegs.
The problem is, thus far we've been thinking that the trick to killing these things has been 'shattering' what essentially equates to a CPU or central core suspended like the 'body' of your typical daddy long legs. Which makes sense if the material were diamond -- however we realised it might be more interesting if kinetic force like cannonballs and explosive shockwaves were less effective, and that the key was 'cutting them.'
Maybe we're bad writers, and we just can't drop the idea of our protagonist being forced to use a 'chain-blade' up close to combat one of these things, but visually we're very keen on just such a scenario. So if those among you more educated than us (i.e. all of you) could point us towards a material where 'cutting' or 'sawing' with what could be called 'super-chainsaws' is more feasible than explosives, large projectiles, or other methods of blunt force, it would be greatly appreciated.
We Do understand just such a material will probably not exist in crystalline form, thus losing the overall aesthetic we're aiming for -- but nonetheless we'd love to hear what you guys have to say in general regarding the question and context.
Thank you very much for your time.