(chaotic, demon, evil, extraplanar)
Source: The Worldwound, pg(s). 44f.
Although they often instigate conflict for its own sake while on the Abyss, gallus are crafty and capable of resisting this natural destructive urge on the Material Plane. They prefer to disguise themselves and spend decades building influence until they reach a position with enough power to incite politicians into waging war. Once both sides have suffered enough, only then will the gallu reveal itself to torment the survivors before moving on.
In the Worldwound, many gallus serve as high-ranking officers in demonic armies, each controlling a few marilith generals and reporting to the Worldwound's leaders like Areelu Vorlesh or Khorramzadeh. A rare few gallus, most often servants of Baphomet, infiltrate the Worldwound's enemies and 'advise' them into launching ill-considered attacks against the demons, and sometimes feed their erstwhile allies legitimate intelligence on the demons, in the hope of encouraging their violent urges.