Only the following cards will activate the Dark World Monster effects:
Card Destruction Morphing Jar Graceful Charity The Creator Dark World Lightning Dark World Dealings Dark Deal Brron, Mad King of Dark World Dangerous Machine Type-6 Dragged down to the Grave Fine Rigorous Reaver Don Zaloog any opponent cards that would discard to the Graveyard.
Basically for Dark World monsters to work, the discard CANNOT be for a cost, such as with Lightning Vortex, Tribute to the Doomed, or Magical Stone Excavation. These require you to discard the cards to activate the effects. The cards I listed above, do not require a discard. Fiend Roar Diety Raven would NOT work since the discard is the cost to activate its ability.