Nekroz of Sophia wrote:Spellcaster-Type ATK 3600 / DEF 3400

You can Ritual Summon this card with any “Nekroz” Ritual Spell Card. Must be Ritual Summoned from your hand by using 3 monsters with different Types you control, and cannot be Special Summoned by other ways.
(1) During either player’s Main Phase 1: You can discard both this card and 1 “Nekroz” Spell Card; during this Phase, your opponent cannot Special Summon from the Extra Deck.
(2) When this card is Ritual Summoned: You can banish all other cards on the field and in both Graveyards. During the turn you activate this effect, you cannot Normal or Special Summon other monsters.

Nekroz of Sword Saint – Zefra Saber wrote:Level 4 Spellcaster-Type ATK 1500/DEF 800 Pendulum Scale 1/1

You can Tribute this card in your hand or on the field to activate its effect, which lets you Tribute monsters from the hand or field to Ritual Summon 1 “Nekroz” Ritual Monster from your hand! And since it’s a Pendulum Monster, while it’ll go to the Graveyard if you Tribute it from the hand, if you Tribute it from the field, it has the benefit of adding itself to the Extra Deck.which will let you set up for your next move! While this card is in the Pendulum Zone, it has the benefit of letting you Pendulum Summon “Nekroz” and “Zefra” monsters!

Nekroz of Blazing Beast – Zefra Exa wrote:Level 5 Dragon-Type ATK 2000/DEF 1000 Pendulum Scale 7/7

If a “Nekroz” or “Zefra” card you control other than “Nekroz of Blazing Beast – Zefra Exa” is destroyed by battle or by a card effect, you can Special Summon this card from your hand or Graveyard! As long as it’s destroyed in a Pendulum Zone or a Monster Card Zone, you can activate this effect! When should you Special Summon him? When your Monster Zone is empty? Do you use it in conjunction with the effect of a “Nekroz” Spell Card in the Graveyard? Be sure to use it well! Its Pendulum Effect is the same as “Nekroz of Sword Saint – Zefra Saber”. Be careful when you Pendulum Summon!