Dragon Rod (3.5e Equipment)
From D&D Wiki
Dragon Rod: Long ago, a wizard made the Dragon Rod to demonstrate that his power stood at the level of the gods. The gods responded by destroying him. The Dragon Rod that he created was then lost.
The Dragon Rod combines two dragon eggs into one, creating a hatchling of hybrid lineage. To activate this rod, the wielder must expend one 7th level or higher spell slot and have two viable, unhatched Dragon eggs.
Most dragons hate this rod, viewing it as blasphemous. All other dragons understand that it not the rod itself that they need be wary of, but the one who wields it. Some evil dragons seek to kill the wielder and destroy the rod. While other evil dragons seek to use the dragon rod to make stronger offspring and enhance their legacy. Good dragons seek to determine whether the current owner has used the staff. If the current owner has not used it, they seek to reason or bargain with her, to save her from her own folly. If this is not successful, they resort to violence. Should the wielder have used the staff, then good dragons feel morally compelled to destroy the wielder for their blasphemy. Both instances in which the wielder is attacked can be avoided however if the wielder surpasses a DC 30 or higher persuasion check if the wielder has not used the rod. If the wielder has used the rod the DC for persuasion increases to 40.
The only known dragon type made from this process is the Shadowfire Dragon, made from the eggs of a Shadow Dragon and a lesser dragon, the Hellfire Wyrm.
It is also of note that dragons created by the rod, and all descendants thereof, appear to feel a form of loyalty to the wielder of the staff as a Gold Dragon to it's parents, with some reports saying it mirrors more closely the relationship between a vampire and their sire.