Negative Dragon Balls

The Negative Dragon Balls are a set of dark blue, black starred Dragon Balls that were created by a Demonic God in Year 58 of the Divine Calendar. After being used they scatter across the universe; they summon Negative Shenron when gathered.

Power
Whilst the limits of the Dragon Balls' power is unknown, their wish granting abilities are far greater than the likes of Shenron, Porunga, and even Ultimate Shenron. Even though Negative Shenron can only grant one wish, users of this set of Dragon Balls will almost always have their wish fulfilled. However, the source of the immense power is negative energy by nature and as a result has massive consequences. The large amount of negative energy from the individual balls alone can corrupt beings which possess large amounts of malice in their heart. On top of this, the Dragon Balls themselves have a form of sentience and will even become hostile dragons after being used if Negative Shenron chooses to. This meaning that most users of these Dragon Balls will die after having their wish granted. The balls themselves are indestructible.

Negative Shenron himself is a terrifyingly powerful being, with strength akin to its creator. Negative Shenron is so powerful that he had killed Demon God Demigra, a feat that most can't even hope to achieve. He is able to transform the Negative Dragon Balls into hostile dragons, usually as an attempt to kill the summoner to bolster his power however the technique itself is draining to use so he only uses it when he feels it necessary.

Wishes made

 * Wishes for youth, riches, immortality and other selfish desires
 * Wishes to revive dead allies
 * Wishes to kill enemies, armies and even entire races
 * Cherri wishes to revive the girl she found at Kanashimi's Station
 * Seed, Princess of the Tuffles wishes to cause an event that nobody is able to prevent except for her, inadvertently causing a merging of multiple timelines called "The Singularity". This also meant that the only way to reverse it is if she sacrificed herself, an unforeseen consequence of her wish

Negative Shenron
Despite his outwards appearance, Negative Shenron is well-spoken and courteous when granting wishes to summoners. In fact unlike Shenron and Porunga, he usually isn't impatient if a summoner doesn't make a wish immediately. He is very cunning and in fact wants people to make wishes for him, even suggesting to summoners wishes they could make or how it should be phrased. This is done to try and create extremely selfish or evil wishes as that increases the might of the Dragon Balls' power. He will inform the user of the technicalities of a wish if it benefits him but will stay quiet if it doesn't concern him. He can (although rarely) decline a wish if he thinks it's "unnecessary", usually resulting in him trying to have the summoner grant a more sinister wish (although if pestered, he will reluctantly grant it as to him, a less selfish wish is better than no wishes).