Its in-game description reads "Magic sword with the power of darkness." Its elemental stats aren't very well balanced, with 4 stats at 0. This sword can be considerably less effective than other ultimate swords, but its 6-hit combo can compensate for its lack of damage. The Dark Cloud can only be obtained with the build-up system, and it cannot be invented or bought in any weapon shops. The Dark Cloud is a high-tier weapon (Tier 8), meaning it'll gain 6 Synthesis Points (SP) per level-up.