Three of the "Heralds" are Level 2 Effect Monsters with 300 ATK and 500 DEF, each named after a different secondary color. The effect of each "Herald" focuses on negating a particular card effect (Monster, Spell, or Trap). In order to activate the effects of a colored "Herald", the monsters must be sent to the Graveyard from the hand, along with another Fairy monster. "Herald of Perfection" a Level 6 Ritual Monster, is the combination of all the effects of "Heralds" with a highly improved effect that can be activated by using a single Fairy for its cost. Newer additions to the series include "Herald of Ultimateness", "Herald of the Arc Light", "Herald of Pure Light", and "Herald of Mirage Lights".
"Heralds" mainly focus on sending themselves and a Fairy 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 monster to negate all types of activation except for a Counter Trap Card.
Cards that prevent Special Summoning will also keep "Herald" out of play, so "Vanity's Fiend" and "Vanity's Ruler" can shut down the "Herald" Duelist's plans. Better yet, "Cursed Seal of the Forbidden Spell" can shut out Ritual Summons permanently. If you negate "Advanced Ritual Art" or "Dawn of the Herald" once, your opponent won't be able to play them again. Cards that banish can also permanently shut down the effect of "Herald of Perfection".