Crystal Ruins

Crystal Ruins, commonly referred to as CR, is an Ice-type dungeon located in Winden, northwest of Snowbasin Town. To access it, you must use Rock Smash and traverse through the Forsaken Bunker. The only weather condition that can occur is hail.

Crystal Ruins is one of the older dungeons in the game, and along with Crystal Castle was the first dungeon to be added to Winden after its release. It was once the hardest non-event and non-set-level dungeon in PMU 7. On June 18th 2019, both Crystal Ruins and Crystal Castle received a revamp.

Attributes
From Floor 11 upwards Regice has a chance to spawn, either when a floor is first entered or as time progresses on the floor. It spawns at level 60 and knows the moves Ice Beam, Zap Cannon, Hyper Beam, and Icy Wind. Regice can drop an Ice Diamond, TM Ice Beam, or its Heart Slate. On Floor 15 is a Sealed Chamber with a Shiny Box that can contain a Clear Silk

Boss
The boss of Crystal Ruins is a Mamoswine. It doesn't drop anything and has the moves, Ice Beam, Bulldoze, Dig, and Take Down. It is always snowing in this room.

Before Fighting: After Defeating:
 * Mamoswine: Who are you to infiltrate this place!?
 * Mamoswine: I am the mighty Mamoswine, and I shall not let you pass! Prepare to be squashed like the insect you are!
 * Mamoswine: My queen...
 * Mamoswine: I'm sorry... that I couldn't protect you...
 * Mamoswine: I'm not strong enough to do anything...
 * Mamoswine: This is your fault... stomping into OUR castle... HER castle.
 * Mamoswine: You may have defeated me, but you won't defeat her. When she defeats you, I hope to never see you again, treading on our sacred home.
 * Mamoswine: She does not show mercy.

Crystal Castle Entrance
After the boss is a midpoint between Crystal Ruins and Crystal Castle. There's a Kangaskhan Storage Rock to prepare before moving onto Crystal Castle.

Secret Room
Secret Rooms can be found starting on Floor 13. It has a single Deluxe Box.

Box items:
 * Icy Rock
 * Icy Dust
 * Frozen Rock
 * Frozen Apple
 * Reviver Seed
 * Frozen Leppa
 * Frozen Oran
 * TM Trick Room

Pokémon
''Pokémon in bold are recruitable. Please visit the Recruitable Pokémon page for more information.''

Dungeon Objectives
Mainly players come to reach Crystal Castle, try to obtain a Clear Silk, or fight Regice for the possibility of it dropping its Heart Slate. Dome Fossils can only be found here, and it's one of the earliest places to obtain a Ghost-type.

Trivia

 * was created by Yatterman.
 * On January 2013 this dungeon, as well as Crystal Castle, was moved from Winden Forest Relic and placed in the overworld of Winden as its own dungeon
 * revamped alongside Crystal Castle on June 18th 2019 by Prismatic.
 * All NPCs at the entrance of the dungeon (including the Forsaken Bunker) were named by players.
 * The story surrounding the creation of this dungeon as well as Crystal Castle is known as The Story of Winden.
 * Kabuto used to spawn as a recruitable in this dungeon, but was removed with the introduction of the Dome Fossil, which can now be found here. Post revamp, Kabuto was once again added as an unrecruitable spawn.
 * Regice, unlike other Legendaries, has a lower chance of dropping a Heart Slate to offset how often it appears.