"Herald", known as "Declarer" in the Japanese and Korean version, is a series of LIGHTFairy-Type monsters. The colored "Heralds" (which are all secondary colors) are Level 2 and have 300 ATK and 500 DEF, while "Herald of Perfection" is a Level 6 Ritual Monster. The effect of each "Herald" focuses on negating a particular card effect (monster, Spell or Trap). In order to activate the effects of colored "Herald", the monsters must be sent to the Graveyard from the hand, along with another Fairy-Type monster. "Perfection" is the combination of all the effects of "Heralds" with a highly improved effect that can be activated by using a single Fairy-Type for its cost. There are other combinations now: "Herald of Ultimateness", "Herald of the Arc Light" and "Herald of Pure Light".
"Heralds" mainly focus on sending themselves and a Fairy-Type monster to the Graveyard to negate an activation of an opponent's Spell, Trap or monster effect. "Herald of Perfection" allows you to send only 1 Fairy-Type monster to negate all types of activation except for a Counter Trap Card. A combination of "Archlord Kristya", "Perfection" and a "Royal Decree" can completely shut down any Deck.
This variation of Deck focuses on use "Dawn of the Herald" to Tribute cards from your hand or field to the Graveyard to Ritual Summon "Herald of Perfection". After you have Ritual Summoned it, you can use the effect of "Dawn of the Herald" to return 1 monster from the Graveyard that you have Tributed for the Special Summon to your hand or not to activate the effect so you can have exactly 4 Fairy-Type monsters in the Graveyard, allowing you to Special Summon "Archlord Kristya", that can prevent the opponent from Special Summoning. "Royal Decree" is used to prevent the activation of Counter Traps which "Perfection" can't negate and to save negations, whereas "Safe Zone" is an alternate option used to protect the "Herald". The release of new "Agents" and "Master Hyperion" in Structure Deck: Lost Sanctuary/Lost Sanctuary Structure Deck greatly improved this Deck.
This Deck is similar to Perfect Herald but focuses on using "Advanced Ritual Art" to send Normal Fairy-Type monsters to the Graveyard; and in the process, Ritual Summoning "Herald of Perfection". These Normal Monsters are then retrieved and used with the effect of "Perfection". "Advanced Ritual Art" can also be used to send exactly 4 Fairy-Type monsters to the Graveyard, allowing you to Special Summon "Archlord Kristya".