Mary Skelter: Nightmares - Route to Underground Cavern's Nightmare
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Mary Skelter: Nightmares - Route to Underground Cavern's Nightmare

By bat0   /   Jul 24, 2018     Guides
Mary Skelter: Nightmares - Route to Underground Cavern's Nightmare

This post-game dungeon's area 2 - 4 are 100x100 tile maps. It can be a chore to fully explore it. This guide will shows you the route to the Core Guardian and Nightmare. Mary Reverser and Hameln is needed for this route.

Mary Reverser and Hameln



To use this route, you need Jack's Mary Reverser and Hameln's Iron Piccolo.

Mary Reverser



Retrieve Gun Parts and give them to Haru to upgrade your Mary Gun. Mary Reverser will be unlocked after all 3 upgrades are done.

Downtown

Get Prison Key 10 on Downtown Area 2 (36,22)

Mary Skelter: Nightmares - Route to Underground Cavern's Nightmare

Unlock the door (27,28) to Area 4

Mary Skelter: Nightmares - Route to Underground Cavern's Nightmare

Area 4 (06,38)

Mary Skelter: Nightmares - Route to Underground Cavern's Nightmare

Dorm

Move forward to Area 3 (5,45)

Mary Skelter: Nightmares - Route to Underground Cavern's Nightmare

Warp puzzle (7,18) (Follow the warp with white stone beside it)

Mary Skelter: Nightmares - Route to Underground Cavern's Nightmare

Get Dorm Key 1 (39,38) (hidden room, use Snow White's bomb)

Mary Skelter: Nightmares - Route to Underground Cavern's Nightmare

Go back to Area 1 and unlock the door (40,31) to Area 2

Mary Skelter: Nightmares - Route to Underground Cavern's Nightmare

Warp puzzle (22,34)

Mary Skelter: Nightmares - Route to Underground Cavern's Nightmare

Area 2 (31,07)

Mary Skelter: Nightmares - Route to Underground Cavern's Nightmare

Station Grounds

Area 1 (14,33)

Mary Skelter: Nightmares - Route to Underground Cavern's Nightmare

Hameln



I prefer to recruit her as soon as possible (Chapter 7). Once you have Mary Reverser, go to City Streets Area 2 (28,10)

Mary Skelter: Nightmares - Route to Underground Cavern's Nightmare

Turn back and use the Reverser to cross the chasm. Move forward to Underground Cavern Area 1 and fight her.

Area 2



Mary Skelter: Nightmares - Route to Underground Cavern's Nightmare

Facing East, use the Mary Reverser to cross the chasm.

Mary Skelter: Nightmares - Route to Underground Cavern's Nightmare

Use the Iron Picollo.

Mary Skelter: Nightmares - Route to Underground Cavern's Nightmare

Use the Iron Picollo.

Mary Skelter: Nightmares - Route to Underground Cavern's Nightmare
Mary Skelter: Nightmares - Route to Underground Cavern's Nightmare
Mary Skelter: Nightmares - Route to Underground Cavern's Nightmare
Mary Skelter: Nightmares - Route to Underground Cavern's Nightmare

Face South and use the Reverser.

Mary Skelter: Nightmares - Route to Underground Cavern's Nightmare
Mary Skelter: Nightmares - Route to Underground Cavern's Nightmare
Mary Skelter: Nightmares - Route to Underground Cavern's Nightmare
Mary Skelter: Nightmares - Route to Underground Cavern's Nightmare
Mary Skelter: Nightmares - Route to Underground Cavern's Nightmare
Mary Skelter: Nightmares - Route to Underground Cavern's Nightmare
Mary Skelter: Nightmares - Route to Underground Cavern's Nightmare
Mary Skelter: Nightmares - Route to Underground Cavern's Nightmare
Mary Skelter: Nightmares - Route to Underground Cavern's Nightmare
Mary Skelter: Nightmares - Route to Underground Cavern's Nightmare

Area 3 to 4 - Getting the Key



Mary Skelter: Nightmares - Route to Underground Cavern's Nightmare
Mary Skelter: Nightmares - Route to Underground Cavern's Nightmare
Mary Skelter: Nightmares - Route to Underground Cavern's Nightmare
Mary Skelter: Nightmares - Route to Underground Cavern's Nightmare
Mary Skelter: Nightmares - Route to Underground Cavern's Nightmare
Mary Skelter: Nightmares - Route to Underground Cavern's Nightmare
Mary Skelter: Nightmares - Route to Underground Cavern's Nightmare
Mary Skelter: Nightmares - Route to Underground Cavern's Nightmare

Grab the heart slate and use Thumbelina's Tiny Princess to shrink it.

Mary Skelter: Nightmares - Route to Underground Cavern's Nightmare

Backtrack to Area 3.

Area 3 - Boss Fights



Mary Skelter: Nightmares - Route to Underground Cavern's Nightmare

Rapunzel's Hair Flair.

Mary Skelter: Nightmares - Route to Underground Cavern's Nightmare

Guardian (weak to Water).

Mary Skelter: Nightmares - Route to Underground Cavern's Nightmare

Nightmare 1st phase (weak to Air).

Mary Skelter: Nightmares - Route to Underground Cavern's Nightmare

Go East.

Mary Skelter: Nightmares - Route to Underground Cavern's Nightmare
Mary Skelter: Nightmares - Route to Underground Cavern's Nightmare
Mary Skelter: Nightmares - Route to Underground Cavern's Nightmare
Mary Skelter: Nightmares - Route to Underground Cavern's Nightmare

Nightmare 2nd phase (weak to Lightning).

Mary Skelter: Nightmares - Route to Underground Cavern's Nightmare

Easy Kill on Boss



(On Horror difficulty you'd need to grind more. High agility and high defense is necessary). The Core Guardian has a multi-hit skill (up to 4 times on a character) that bypass Paladin's Cover. The Nightmare will always open with Sleepy Times (AoE Sleep) & Tremor (on its 2nd fight).

For the Guardian, Physical Resist gear is useful for mitigating the damage. For the Nightmare, Andvaranaut accessory along with Physical Resist and/or Earth Resist gear. You can purchase Andvaranut from the wandering merchant in Jail Tower. Shrink it first to minimize the stat decrease.

The quick and easy way to defeat them lies in Jail Bonus Wheel buffed by Logic's passives.

Spec Snow White and/or Gretel as Logic and max out the Jail Up passives. (You can spec them as Item Meister, Mimic, and Blood chemist first if you want versatility). Make sure the Hunger and Libido bonus can be activated within one attack / lick.

With Logic's Jail bonuses, the % damage to enemy is increased and can occurs twice. On normal difficulty, the Nightmare received 22k(!) damage. Doubled, it's already 44k. It's possible to defeat it before it takes another turn.

Area 5



After defeating the nightmare, you can access this area.

Mary Skelter: Nightmares - Route to Underground Cavern's Nightmare

Cinderella's Twelve Dash.

Mary Skelter: Nightmares - Route to Underground Cavern's Nightmare
Mary Skelter: Nightmares - Route to Underground Cavern's Nightmare
Mary Skelter: Nightmares - Route to Underground Cavern's Nightmare

Use the switch to open the locked gate.

Mary Skelter: Nightmares - Route to Underground Cavern's Nightmare

Backtrack or use Reverser.

Mary Skelter: Nightmares - Route to Underground Cavern's Nightmare
Mary Skelter: Nightmares - Route to Underground Cavern's Nightmare
Mary Skelter: Nightmares - Route to Underground Cavern's Nightmare
Mary Skelter: Nightmares - Route to Underground Cavern's Nightmare

Same as before. Explore or use Reverser.

Mary Skelter: Nightmares - Route to Underground Cavern's Nightmare

Forward to Area 4.

Mary Skelter: Nightmares - Route to Underground Cavern's Nightmare
Mary Skelter: Nightmares - Route to Underground Cavern's Nightmare
Mary Skelter: Nightmares - Route to Underground Cavern's Nightmare

Hameln's Iron Piccolo then get across with Reverser or Gretel's Bread Portal.

Mary Skelter: Nightmares - Route to Underground Cavern's Nightmare
Mary Skelter: Nightmares - Route to Underground Cavern's Nightmare

Kaguya's Bamboo Guard.

Mary Skelter: Nightmares - Route to Underground Cavern's Nightmare
Mary Skelter: Nightmares - Route to Underground Cavern's Nightmare

To unlock the gate, extinguish the 3 candles with Mary Gun.

Mary Skelter: Nightmares - Route to Underground Cavern's Nightmare
Mary Skelter: Nightmares - Route to Underground Cavern's Nightmare
Mary Skelter: Nightmares - Route to Underground Cavern's Nightmare

Area 5.

Mary Skelter: Nightmares - Route to Underground Cavern's Nightmare
Written by bat0.