Do the quest with the least amount of party members as possible, it's easier this way because you only need to get the items once

Ice Pick [1] with baphomet_card is a good weapon of choice if you can wear it, alot of monsters there are vulnerable to Ice Pick effect (Thana Effect / Occult Impaction Effect)

If you're a tank class, consider these gear set up:

Garment: Salamander Card

Footgear: dark_lord_card

Accessory: Ring of Resonance

Headgear:Queen's Bells

If you somehow get a mob going, you can endlessly spam meteor_storm and kill a lot of monsters

Do bring yggdrasil_berry, Reraise Potions and Panaceas (You get Poisoned)