With the new Boss, you can summon any Fiend monster, but be careful because there's a lock card, meaning you can only summon Archfiend monsters from the Extra Deck, and those Extra Deck Archfiend monsters are... *sobs* lmao lmao

Archfiend Gameplay Guide
Sections covered in this guide:
CORE
If the searcher is summoned to the field with Ritual, and is holding it in their hand, it's a brick.
This card can be sacrificed from your hand or field to search for another Archfiend monster/spell/trap from your deck to add to your hand (except for copies of this card).
The deck's huge chokepoint, searches for two cards, and it's a LIGHT Fiend.
This card has the ability to select one monster on the field, then send an Archfiend monster from the deck to the graveyard and increase the level of the selected monster by the level of the monster sent to the graveyard.
brick when held in hand with handtrap
All Fiends in the Extra Monster Zone gain 1000 ATK (including enemy monsters).
Ohmmmmm, it uses the Matador Archfiend ritual, which allows it to banish from the graveyard to summon an Archfiend without using Ritual from its hand to the field.
Summoning Ritual Archfiend from your hand (after searching), face up on your Extra Deck (after searching or returning to your field), or banishing it to the field is generally quite good. The conditions are also easy; you just need to Tribute a monster from your hand or field that is equal to or greater than your Ritual Level.
Peak, can only be activated once per turn.
Not once per turn: If you have a Fiend monster, play 1 card on the field and send 1 Fiend monster from your deck to the graveyard.
Target and negate one of your opponent's face-up cards if you have a Ritual Archfiend monster in the Extra Monster Zone.
Staple
This card is a normal summon; you can summon a Level 3 Fiend monster from your hand or deck, but its effect is blocked (although blocked, the body still works fine; for example, Highness Archfiend is a LIGHT Fiend, which only blocks the effect on the field, and it can still activate in the graveyard).
Djinn : This card is the entire material for Ritual cards, obtained by banishing them from the graveyard. If this card is used as the Ritual material for any card, that card cannot be targeted by an opponent's card (it's quite good at resisting Imperm when your boss clears the field).
Fusion is done using materials from the graveyard, so it's very easy to match the materials to the monsters. The fusion method is shown in the image.
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