Dungeon Lootr Dreadlord: Underworld Glaive & 1% Drop

The route

1. Clear Bandit’s Den, Goblin’s Stronghold, Forgotten Ruins, The Catacombs and Frostspire Bastion to unlock Underworld Gate (see the dungeon order).
2. Obtain the Underworld Glaive class item from the Gate.
3. Run Underworld Gate on Nightmare until the ~1% Dreadlord drop happens.

The rate is community-reported and it did not get kinder at global release. Showcase videos love the kit; the farm is the price.

The kit

Crimson Rush, Dread Vortex, Gravefall and Rose Cataclysm. The Sep 1 ranking singles out the second and fourth skills for clearing and farming difficult stages, which is why it ranks S/A even without the raw ceiling of Sinister Trigger. Stat sheet Strength.

What to bring

Gear Score from the Forge and a kit from A-tier or better — Azure Devil, Witch Gunner or a Boss Rush class. Sanguine helps a solo Nightmare loop; Ruin helps the boss. A Glaive on Ronin is, as one community wiki puts it, a joke.