Children of the Fates

Children of the Fates is a series of LIGHT and DARK, Psychic-Type  Spirit Monsters that focus on creating a solid defense by discarding themselves in order to counter certain actions. The series also includes a number of Spell Cards and Trap Cards that focus broadly on gneral Spirit Monster support. The series was created by user, JrH154, and was released in June of 2015.

Members
There are a total of 8 monsters in the set:  6 Main Deck monsters, and 2 Extra Deck monsters. These 8 are split into 2 categories:  LIGHT-Attribute and DARK-Attribute.

Playing style
With the exceptions of the two Extra Deck monsters, every monster in the set can discard itself to activate an effect. Usually, this is to counter an opponent's play, or to otherwise slow down the game's speed to a more managable pace. In combination with the Spell and Trap Cards, the series can perform a large amount of searching and recycling, ensuring that the player always has the cards that he/she needs at any given moment. Many of the Spell/Trap Cards require the player to reveal a number of Spirit Monsters with the same Type and/or Attribute in their hand.

The Level 4 DARK-Attribute monsters focus on countering Spell and Trap Cards as a whole. "Mono the Fateless" prevents Trap Cards from being activated, and negates the effects of Trap Cards already on the field. "Mono the Undying" has an identical effect, but counters Spell Cards instead of Trap Cards. Both of these monsters require that the player already controls a Spirit Monster. Additionally, both of their effects will only be in effect during the Phase that the player activates them. For example:  Activating the effect of "Mono the Undying" during Main Phase 1 will prevent both players from using Spell Cards during Main Phase 1, but NOT during the Battle Phase, Main Phase 2, etc.

The Level 4 LIGHT-Attribute monsters focus on protecting other Spirit Monsters the palyer controls. "Haru the Boundless" will negate cards and effects that target Spirit Monsters (such as "Fiendish Chain"); and "Haru the Awakened" will negate cards and effects that would destroy Spirit Monster (such as "Dark Hole").