This deck is usually a deck that prefers to go second, as the main gameplan is to summon Condemned Darklord as quickly as possible if your opponent has a board with a lot of Monsters. If they don't negate anything, Normal Summon Darklord Morningstar using Condemned Darklord's effect and try to get some Level 8s (Superbia/Zerato) or Level 10s (2 Ixchels) to go into Xyz plays. If the opponent isn't immune to destruction effects, Xyz Summon Number 35: Ravenous Tarantula to get rid of all their monsters, otherwise, summon Dingirisu, use its effect, and then Rank Up into Number 77: The Seven Sins by summoning Number 84: Pain Gainer.
I picked Dangers! as a side engine for more draw power and the ability to get rid of certain cards in your hand, which Darklords can use in the GY. Bigfoot and Thunderbird were chosen specifically because they're Allure of Darkness and Trade-In targets and they can also pop cards if you need them to.
Monster Gate and Reasoning serve as potential millers for the deck, which can also lead into easy Special Summons. Be aware that any Nasten or Ixchel that you already Special Summoned this turn will just get milled if Monster Gate or Reasoning got it. Morningstar will always be milled because it can't be Special Summoned. For Reasoning, your opponent will most likely guess Level 8 if they know the Darklord matchup.
The most common way to turbo out a Morningstar is by using Ixchel and discarding another Darklord monster, drawing 2, and then using Darklord Contact to Special Summon Ixchel and then the other Darklord. Do this the other way around if you discard Superbia with Ixchel's effect. Link those 2 Darklords into Condemned Darklord, then use its effect (preferably discard a Darklord Trap or a Danger! Monster) and search for Morningstar. Use Morningstar's effect to swarm the board with huge Darklords and then go into your plays from there.
The main weaknesses to Darklords as an archetype are basically backrow removal and their dependence on Special Summoning and draw power. DROLL & LOCK BIRD IS REALLY ANNOYING FOR THIS DECK. Zombie World changes your gameplan of Summoning Morningstar because Condemned Darklord requires Fairy Monsters. This means Zombie World also makes Superbia's effect not work. Because the deck is mostly Dark-Attribute, that does mean your opponent can use Super Polymerization to summon Starving Venom Fusion Dragon, so be aware that they can disrupt your plays that way.
However, they are really good at non-targeting effects, as all of their Trap cards don't target and Dingirsu has non-targeting removal. They're also really great at summoning a bunch of high ATK/DEF monsters to the field if your opponent isn't the strongest against high ATK/DEF swarm.
For the side deck, I have 3 Twin Twisters for the backrow removal issue, 2 Darklord Tezcatlipoca if you need an extra Darklord with the Spell/Trap effect, 2 The Sanctified Darklord in case I need to search for effect negation or mill it with Ukoback, 2 Archlord Kristya for another Trade-In target and in case I need to lock my opponent out of Special Summoning, and 2 Michion, the Timelord for another Level 10 and for huge damage (Xyz into Gustav Max in MP2 to do even more).
Other side deck cards (these might change later on) are Superdreadnought Rail Cannon Juggernaut Liebe, Number 23: Lancelot, Dark Knight of the Underworld, Five-Headed Link Dragon (it does come up sometimes), and Topologic Bomber Dragon.