Omega Turnip

The omega turnip is a powerful turnip, regarding deep inside dark-matter space. It's very rare. Very powerful. Not to be approached. Emits enormous amounts of radiation, much like that of an active galaxy. Said to be a creation of the radish lord, to destroy all turnips. However, his plan failed, causing the omega turnip to regard in it's natural home, dark-matter space.

Radioactivity
It releases approximately 5,000 MegaRads of gamma radiation per second. Fortunately, it lives in dark-matter space, so there's no one to harm with that radiation. Do NOT remove it from it's home. It is guaranteed to cause a mass extinction on any planet they touch. Even if you are a Supernatural Being (the only type of organism that can touch this thing and live to tell the tale)

Taste:
No one knew at first, although there were rumors that it tastes a bit like soap. These rumors were confirmed after a curious Supernatural Being from the TOTMGsRock Universe stumbled upon this turnip and tasted it (The Omega Turnip is too hard to be chewed by ANYTHING, so of course he didn't eat it).

Potential for use of indestructible materials
Whatever the Omega Turnip is made of, it is completely indestructible. Absolutely NOTHING can destroy it. Therefore, there are a few scientists who wonder if the materials that made this turnip can be used for building indestructible things. However, this claim has been negated by the fact that the materials release too much radiation to be used for normal military purposes.