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Siege of Dragonspear has items that provide special bonuses for each of the playable races, except human and half orc.
If you were to add an item for Half Orcs, what would it be?
Or heck, you can do humans too, if you swing that way.
I think I'd do a ring. It's lore would be that it was something Ilneval, god of (among other things) halfbreeds created to aid in the crushing of other religions. It could emanate an anti-divine magic aura once a day. The aura would give a 75% chance of divine spell failure if a half orc used it, 50% chance if other halfbreeds used it, and a 25% chance if anybody else used it.