They're added in v5.0 along with the prison raid, where the recipes drop.
They got unusually high atk, both the greatsword and blunt have a higher atk then the 33 constellation equivalent. however the polearm only has a bit higher atk then a 32 ar polearm.
Where to get Materials and recipe:
- Dragon heart's only drop as recipes of Swamp Angler's, Kings of Coverty, Heavenly Giant Keeper, Heavenly vesp soldiers, Uranus,Instanced Uranus, Instanced Griffon, Castilla Raids, Castilla Relix Echanger, Castilla Treasure Hunt and . (2% droprate for most)
- Grade 32 weapon crystals are gotten from breaking elemental gate weapons, +6 30 ar weapons or +5 31 ar weapons at El Dorado.
- Mega Quartz drops in prison raid (of mobs) and in Castilla raids (of bosses)
- Iron Ore drops of ore's in castilla raids. (you need a pickax to be able to get them)
- The weapon recipes drop of Prison raid's roulette with a semi low chance.
screenshots: click here
Source: 2ch wiki and wordwood