Writhing

Dark (うごめく) is a material type available in Kingdom Hearts II. Dark materials contain the essence of darkness, and are colored black.

Kingdom Hearts II

 * Dark Shard : Shadow (4%), Soldier (8%)
 * Dark Stone : Assault Rider (12%), Nightwalker (10%)
 * Dark Gem : Gargoyle Knight (10%), Gargoyle Warrior (8%)
 * Dark Crystal: Air Pirate (8%)

Kingdom Hearts II
Dark materials are used to synthesize the following items:
 * Power Band (1 Dark Stone)
 * Buster Band (1 Dark Stone)
 * Garnet Ring (1 Dark Shard)
 * Diamond Ring (1 Dark Shard)
 * Mythril Ring (1 Dark Stone, 1 Dark Shard)
 * Orichalcum Ring (1 Dark Stone, 1 Dark Shard)
 * Soldier Earring (1 Dark Gem)
 * Fencer Earring (1 Dark Gem)
 * Expert's Ring (1 Dark Crystal, 1 Dark Gem, 1 Dark Stone, 1 Dark Shard)
 * Master's Ring (1 Dark Crystal, 1 Dark Gem, 1 Dark Stone, 1 Dark Shard)
 * Elixir (1 Dark Stone)
 * Megalixir (1 Dark Stone)
 * Drive Recovery (3 Dark Shard)
 * High Drive Recovery (3 Dark Shard)
 * AP Boost (2 Dark Crystal)
 * Magic Boost (2 Dark Crystal)

Notes and References
Noir