Momentum Soulstones
These stones are extremely complicated to make and have the ability to add speed to the movement of an object or themselves. The means with which this is done can vary during the creation process.
Manufacturing
Only the high-level wizards generally will have the commitment and focus to create a soul stone in the first place.
Complexity
The creation of a momentum stone, very much like all stones is an extremely complicated process that takes years upon years to master and years to teach.
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