User blog comment:Kyle2Death/"Super Nantomium Strongboxs"?/@comment-25862085-20150416225148

I'm pretty sure the "Super Nantomuim Strongbox" is a Nanto strongbox that is gurenteed to drop a 10*** item, and the only way to get this is to have a Nano spawn while you have High Roller. Now if the Nano would've dropped without High Roller, its becomes a SNB and is gaurenteed to drop a 10***. Now its still just luck on anything else. Nightmare mode just helps it as well.