Crystal Ruins

Crystal Ruins, also known as CR, is an Ice-type dungeon located in Winden, northwest of Snowbasin Town. Crystal Ruins and Crystal Castle were the first dungeons to be added to Winden after its release. It was once the hardest non-event and non-set-level dungeon in PMU 7.

The Pokémon in this dungeon are mainly in the level range of 35-41, though Gastly spawn lower, and Regice is level 60. It is usually Hailing. Foggy and Cloudy weather can also obscure vision.

Floors 1-13
The walls are crystal-like and dark blue with some green crystals scattered around. The floor is a light-blue stone, with some blue rocks here and there. From Floor 11 upwards Regice has a chance to spawn, although in rare cases it will make a surprise attack. Regice can drop an Ice Diamond, TM Ice Beam, or its Heart Slate. It spawns at level 60 and has the following moves:
 * Ice Beam
 * Zap Cannon
 * Hyper Beam
 * Icy Wind

Floors 14-20
On Floor 14 the dungeon starts gaining darkness, and the floor turns to snow.

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

Boss
The boss of Crystal Ruins is a Mamoswine, it doesn't drop anything and has the following moves:
 * Ice Beam
 * Bulldoze
 * Dig
 * Take Down

Before Fighting:
 * Who are you to infiltrate this place!?
 * I am the mighty Mamoswine, and i shall not let you pass! Prepare to be squashed like the insect you are!

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

 * This dungeon 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
 * The story surrounding the creation of this dungeon as well as Crystal Castle is known as The Story of Winden.
 * Kabuto used to spawn in this dungeon, however the spawn was removed with the introduction of the Dome Fossil, which can now be found here.
 * Regice spawns with multiple Buffs placed on it.
 * Regice, unlike other Legendaries, has a lower chance of dropping a Heart Slate to offset how often it appears.