Glad you brought up the Spear of Shojin. A perfect example of an item catered to the lovely class we know as divers. You know who falls into said category? Oh that's right, RIVEN. Not to mention she does builds involving bonus AD, she can make the most out of it considering even if her build falls short of capping the reduction to 80, her trustly old friends of Conqueror and her ult can easily get her there. Dive into the middle of 5 people and proc the Dragon's Heart active, and abuse the godly shield that will hardly break with that 200% damage reduction bonus that, by the way, refreshes on takedown.