"Eldlich" (エルドリッチ Erudoritchi) is an archetype that debutted in Deck Build Pack: Secret Slayers with further support in Blazing Vortex.
"Eldlich" is a portmanteau of "Eldritch" and "lich", and also a play on the name of the mythical city of gold El Dorado.
This archetype is centered around the monster Eldlich the Golden Lord and is supported by the "Eldlixir" and "Golden Land" archetypes. The deck's playstyle revolves around getting Eldlich to the field as quickly as possible, either through his own effect or the "Eldlixir" cards. From there, the deck uses a control and swarm playstyle to allow "Eldlixir" cards to summon more Zombie monsters and the "Golden Land" Trap Monsters to do additional effects when summoned with Golden Lord on the field; such as destroying a card on field, banishing a card from GY, or lowering a monster's ATK to 0.
Alongside this, all "Eldlixir" cards and some "Golden Land" Traps have effects to banish them from the GY and set the opposite archetype's cards from the Deck to the field for next turn. For a last resort option, use the Trap El Dorado Adelantado, which has 2 effects to use by recycling 3 different named copies of "Eldlixir" or "Golden Land" cards; either destroy the board through recycling "Eldlixir" cards or halving the opponent's LP and gaining that much through recycling "Golden Land" cards.
With the release of "Blazing Vortex", the "Eldlich" archetype gained a new Fusion Boss Monster in the form of "Eldlich the Mad Golden Lord", who is treated as the original Golden Lord and has protection and added further disruption to this archetype's playstyle through Tributing Zombies to take control of monsters the opponent controls without the ability to attack or use their effects for the turn.