Brittle.

Tough as diamonds, I still stutter.
Even equipped with spirit real resilient.
Titanium temper you can't tamper.
Bullet proof; I am bone brilliant.

No weapon could wage war against me.
You are Hiroshima to my bomb atomic.
Hydrogen gases could never harm me.
Napalm nor nitrous oxide could phase me.

When I fell to this planet, I crash landed.
Rode in careening on a comet.
Like obsidian, I am igneous; volcanic.
Concrete, cinder-block, ceramic.

Jackhammer my stone heart in the street, chances are the road will crack before me.

I survived storms, and tsunamis;
scaled sorrows, climbed calamity.
Rappelled into the fiery pits of Hell,
wrestled with remorse, and reversed spells.

I can't be destroyed now—I refuse it.
My lights may flicker, but they won't finish. 
Any attempts to break me will prove fruitless.
Diamond life of mine can't be cut open.