Color Spray Nebula

The Color Spray Nebula was a fan-shaped nebula in Realmspace. It was visible from Toril during spring and early summer and appeared like a flashy multicolored object similar to the effects of a color spray spell.

Geography
The Color Spray was a huge multicolored cloud about 2 million miles (3.2 million km) long, 1 million miles (1.6 million km) wide at one end and 100 ft (30.5 m) wide at the opposite end.

When a spelljammer entered the region, its crew felt a slight tingling sensation, which was a side effect of the nebula's healing properties. A creature entering the nebula was immediately cured of any diseases. However, there was a small (but cumulative) probability that they would also contract a deadly and incurable cancer, that could only be removed by powerful magic such as a wish spell.

Another effect of the nebula was to sometimes drain protective magic items, since its magic seemed to be non-sympathetic to abjuration effects. Items such as rings, armor and cloaks of protection were all at risk of having their magic properties weakened or drained away entirely by the nebula.

Rumors & Legends
The nebula was seen by followers of Mystra as a sign that the deity was pleased by their use of magic. It was also seen by followers of Bane as a sign of his wrath: a destructive object that annihilated everything in its path.