Animosity

Black Orcs are not affected by the squabbling and infighting that characterises other Orcs and Goblins, and never test for animosity. It is possible that Black Orcs may be the victims of animosity, and if attacked by brawling Orcs or Goblins they will certainly fight back just like any other Orcs.

Leaders

Black Orcs don't think much of other Orc Bosses. If another Orc or Goblin character model joins the unit he will be allowed to fight with it, but the Black Orc unit will refuse to take much notice of him. This means the unit cannot test against the character's leadership as it normally would.

Black Orc Leaders

Black Orc characters can join up with other Orc or Goblin units and lead them, exactly as described in the rules. Because the unit is led by a Black Orc it wouldn't dare start scrapping amongst itself and so doesn't suffer from the normal animosity rules. In fact, the unit is treated exactly like a unit of Black Orcs for animosity.

Panic

Black Orcs think so little of other Orcs and Goblins that they do not have to take a panic test if they break or flee past them during the turn. Black Orcs expect other Orcs and Goblins to run away - when they do it merely confirms the Black Orcs' conviction that they are the best. This applies only to Black Orcs, not to units of other Orcs or Goblins being led by a Black Orc character.