Each young acolyte to the Dezun order must complete a series of rites before becoming a shadow priest. The final rite, the rite of shades, is a harrowing spiritual journey through the Nothl Realm, an unpredictable domain from which not all visitants return. Of those who do, some return mad. Others return with strange aptitudes. But all who go there are changed by their experiences. Driven by the need for enlightenment, Dazzle was the youngest of his tribe ever to request the sacred ritual. At first the order refused him, saying he was too young. But Dazzle was not to be dissuaded. Sensing something special in the headstrong young acolyte, the elders relented. Dazzle drank down the sacred potion and sat by the fire while the rest of his tribe danced through the night. In this ethereal dimension of the Nothl Realm, the properties of light and dark are inverted. Thus his brilliant healing light, beautiful to our eye, is actually a sinister kind of evil; and the darkest deeds are done in a dazzling glow. The elders' intuition was prophetic: Dazzle returned to his people as a Shadow Priest like none seen before, with the power to heal as well as to destroy. Now he uses his gift to fight his enemies and help his friends.
potentially 46armor reduction to a single person and a stun and a immortality buff.
In fact as i said, sobi is better then RoB just if you get it for the mana reg ;)
If you get Basilius just for your mana regen, then is better to get just sobi, since 0.65 mana/sec is less then the +50% mana reg after an hero get more then 32 int, which happen at level 3 for dazzle.
Basilius is also an aura though, and gives some nice armor, which shouldn't be underestimated.