Dark World " Dark World " ( " Ankokukai " ) is an archetype consisting of DARK Fiend monsters . They were introduced in " Elemental Energy " , with further support in " Strike of Neos " , " Gates of the Underworld Structure Deck " and " Primal Origin " . Brron , Mad King of Dark World uses this archetype in the " Yu - Gi - Oh ! GX " anime . The anime - only " Dark Corridor " also belongs to this archetype since its kanji name contains " 暗黒界 " . " Darkworld Thorns " and " Cyber Soldier of Darkworld " are not " Dark World " cards , reflected by their names using " Darkworld " instead of " Dark World " . Naming . The names of " Dark World " monsters are mostly based on colors , many of which feature prominently in their artwork and their army positions . The English names are based on the words for the colors with extra letters added . The Japanese names are based on the transcriptions of the English words for the colors with one ore more deleted . The Chinese names are combinations of the color names and / transliteration of English or Japanese words , in terms of phonetics . Basic strategy . " Dark World " cards are generally intended to gain advantage by activating Summoning , destruction , and other effects through discard ing cards ( through effects ) from your hand into the Graveyard . Many " Dark World " monsters gain extra effects if discarded by an opponent ' s effect . They are based around effects that activate when they are discard ed from the hand to the Graveyard by a card effect . This does not include cost s that require the user to discard , such as " Lightning Vortex " or effects that send cards from the hand to the Graveyard , without discarding , such as " Hand Destruction " . " Dark World " monsters can rapidly and aggressively swarm the field and overwhelm the opponent by destroying and discarding your opponent ' s cards . The deck ' s main boss monster , " Grapha , Dragon Lord of Dark World " , has a built - in destruction effect and the ability to Special Summon itself from the Graveyard ; coupled with its high ATK , it is the key card in any " Dark World " Deck . With the " Gates of the Underworld Structure Deck " , the Deck picked up more speed in Summoning and getting card effects . In addition to the aforementioned " Grapha " , it introduced " Snoww , Unlight of Dark World " , whose effect allows for quick searches and Deck thinning . On the other hand , the Deck no longer needed to rely on " Goldd , Wu - Lord of Dark World " and " Sillva , Warlord of Dark World " for power . Their high Level means that they will often sit unused in the hand ( although they can still be viable for some strategies , such as a Rank 5 Xyz Summon ) . Using your discard outlets for other cards such as " Grapha " or " Snoww " is often more favorable to either immediately remove a threat , or search the Deck for a card you need . Another uncommon strategy is discarding " Ceruli , Guru of Dark World " when you have a " Dark World " monster that gains effects when discarded by an opponent ' s card effect ( e . g . " Reign - Beaux , Overlord of Dark World " , " Goldd " , or " Snoww " ) . Since the effect of " Ceruli " summons itself on the opponent ' s side of the fireld , " you " are the target of its discard effect ; this gives your " Dark World " monster a special effect and wastes the opponent ' s field space . " Dark World Brainwashing " and " Dark Deal " , disrupt with the opponent ' s cards as they change Effects into a random discard on you . As per the New Master Rules , " Dark World " suffers almost nothing and can gain a better field control as the ooponent would lack a strong Monster to take down your Monster . Discard effects . This section will show exactly which effects are activated with any " Dark World " monster ' s discard . This also shows exactly the additional effect that happens when the opponent ' s effect is the cause for the discard . " Dark World " cards do not activate if they are discard ed as part of a cost ( e . g . " Lightning Vortex " or " Monster Reincarnation " ) , but they have several cards that force discards as an effect ( e . g . " Dark World Dealings " , " Dark World Lightning " or " Brron , Mad King of Dark World " ) . The difference has become easier to determine with the July 2011 " Problem - Solving Card Text " solution . Now all cards with a " discard " effect occurring after a semicolon , " ; " , are effects that will cause " Dark World " monsters ' effects to activate . ( See " Discards for effect " for a list of such cards . ) In general , a " Dark World " Deck should not rely too heavily on card effects that require the opponent to force a discard . Although the archetype has some means of forcing the opponent to make you discard , their situational nature means that you will often have difficulty making the most of the effects .