You can get orriculam from treasure chests and bulky venders. You can get Dense crystals from berserkers.
The world that never was.
The best place would be The World That Never Was.
Dense Shards are found in Twilight Town, Hollow Bastion, The World That Never Was, and Beasts Castle
Mythril Crystal aren't dropped by enemies, they have to be found. Here's where you can find them. Rabbits House and the Spooky Cave in the 100 Acre Wood, Ship Graveyard Seadrift Row in Port Royal, Pit Cell in Space Paranoids, the Underground Concourse, Tunnelway, Sunset Terrace, Mansion Foyer, Mansion Dining Room in Twilight Town, Throne Room in the Land Of Dragons, and Fragment Crossing, Memory's Skyscraper, Naught's Skway, and Ruin and Creations Passage in The World That Never Was. You can also synthesize them by combining one Dense Crystal, 3 Dense Gem, 1 Twilight Crystal, 3 Twilight Gem, and 1 Serenity Stone.
Lead glass is made with lead oxide PbO this makes it dense. It also has a higher refractive index than ordinary glass. It is sometimes called "lead crystal glass" and has been used to make cut glass ornaments and decanters. There is a lead poisoning risk from drinking wine that has been stored for long periods in lead crystal decanters.
Density current
1 Orichalcum, 3 Dense Crystals, 5 Dense Gems, 7 Dense Stones, 9 Dense Shards, and 1 Serenity Crystal. (If you want Save the Queen+)
In both games, you have to synthesize it. In Kingdom Hearts, you need: * 5 Lucid Gem * 5 Power Gem * 5 Thunder Gem * 3 Mystery Goo * 3 Gale In Kingdom Hearts 2, you need: * 13 Orichalcum+ * 1 Orichalcum * 1 Mythril Crystal * 1 Dense Crystal * 1 Twilight Crystal * 7 Serenity Crystal As well as the Ultimate Recipe, which is found in the Mansion at Twilight Town.
In the Kingdom Hearts II video game, the Ultima Weapon may be synthesized by obtaining all seven Orichalcum+ items, along with Serenity, Mythril, Dense, Twilight, and Energy Crystals. In game, the recipe for Ultima Weapon requires thirteen Orichalcum+, but by using an Energy Crystal, this reduces the amount of needed materials to seven.
Blazing Shard, Blazing Stone, Blazing Gem, Blazing Crystal. Frost Shard, Frost Stone, Frost Gem, Frost Crystal. Lightning Shard, Lightning Stone, Lightning Gem, Lightning Crystal. Lucid Shard, Lucid Stone, Lucid Gem, Lucid Crystal. Power Shard, Power Stone, Power Gem, Power Crystal. Dark Shard, Dark Stone, Dark Gem, Dark Crystal. Dense Shard, Dense Stone, Dense Gem, Dense Crystal. Twilight Shard, Twilight Stone, Twilight Gem, Twilight Crystal. Mythril Shard, Mythril Stone, Mythril Gem, Mythril Crystal. Bright Shard, Bright Stone, Bright Gem, Bright Crystal. Energy Shard, Enerfy Stone, Energy Gem, Energy Crystal. Serenity Shard, Serenity Stone, Serenity Gem, Serenity Crystal. Orichalcum, Orichalcum+
The ingredients for the Mythril Crystal are:1 Dense Crystal (Berserker - The World That Never Was)3 Dense Gems (Samurai - The World That Never Was)1 Twilight Crystal (Sorcerer - The World That Never Was)3 Twilight Gems (Assassin - The World That Never Was)The locations shown are where these Nobodies are commonly found in.
The Ultimate Recipe is found in a chest at the Mansion: Basement Corridor. The Ultima Weapon is a rank S synthesis item that provides 119 EXP. An Energy Crystal is required to reduce the Orichalcum+ required for synthesis, as there are only 7 in the game; this means that the Ultima Recipe cannot be synthesized unless the Moogles are at least level 2. As Serenity items are part of the recipe, they cannot be used to upgrade it.13 Orichalcum+1 Orichalcum1 Mythril Crystal1 Dense Crystal1 Twilight Crystal7 Serenity CrystalI got this from: http://kingdomhearts.wikia.com/wiki/Ultima_Weapon#Kingdom_Hearts_IIPlease help yourself to anything this is a great website for help if you dont know what to do on any Kingdom Hearts game.
Certain nobodies such as the berserker and the samurai
The best place would be The World That Never Was.
just get all the items from all the different world but sererophth the guy with a wing would have either a oriculam+ or a serenity crystal but you need 7 oriculam+ not 13 1 dense crystal, 1 mythrill crystal, 7 serenity crystals, the serenity crystals you can get from sorcerers assassins samurai one oriculam is in a box get on a tram train in the first world you start at go to the train station and get on the train that is not purple then get on the tram car you will see it on a building's top, then clear all the places you can get too other then the very last world ok, and excuse me for my spelling OK! *cough* lets get this straight 7 oriculam+ 7 serenity crystals 1 dense crystal and mythrill crystal and a regular oriclum ok!
Dense Shards are found in Twilight Town, Hollow Bastion, The World That Never Was, and Beasts Castle
Kingdom HeartsUltima Weapon can be synthesized once the fifth list is unlocked. 5 Lucid Gem5 Power Gem5 Thunder Gem3 Mystery Goo3 GaleKingdom Hearts Final MixUltima Weapon can be synthesized once the sixth list is unlocked. 5 Thunder Gem5 Mystery Goo3 Mystery Power3 Gale Stone3 Dark MatterKingdom Hearts IIThe Ultimate Recipe is found in a chest at the Mansion: Basement Corridor. The Ultima Weapon is a rank S synthesis item that provides 119 EXP. An Energy Crystal is required to reduce the Orichalcum+ required for synthesis, as there are only 7 in the game; this means that the Ultima Recipe cannot be synthesized unless the Moogles are at least level 2. As Serenity items are part of the recipe, they cannot be used to upgrade it. 13 Orichalcum+1 Orichalcum1 Mythril Crystal1 Dense Crystal1 Twilight Crystal7 Serenity Crystal
In KH1: Beat the Hades cup with only Sora. In KH2: It has to be synthesized. You will need the following materials: 1 Orichalcum, 3 Dense Crystal, 5 Dense Gem, 9 Dense Stone. and 9 Dense Shard.