Fire Dust lances allow the lance to ignite for extra burn damage. Kei also uses the eject function to drive the lance into the enemy and internally burn them.
Ice Dust lances create a jagged, sharp layer of ice around the lance, for extra laceration damage. This also makes the lance more cumbersome. Kei uses the eject function to use this as a range option, however it is not reliable at all.
Electric Dust lances electrify the lance and electrocute enemies touched by it. Kei can eject this lance and electrocute enemies from within.
Kinetic Dust lances do not give the lance any special powers. However, when ejected, the dust gives the lance much more force, allowing the lance to fly much further than usual. This can also be used point-blank to skewer enemies.
Combination Dust lances are very volatile, as they are a mixture of every dust, and thus Kei does not use this for combat. However, when ejected, Kei can remotely detonate the dust within for a elemental explosion.
All the listed lances above (apart from Combination) have a active duration of up to 3 minutes. They become used up after that duration and become regular Steel Lances.