Tetrahedron of echo

The Tetrahedron of echo is a tetrahedron that allows the user to control echo. Doing so can make the user's voice echo limitlessly, regardless of their environment - however, that is just how much can be done by novice users of the shape. 
With enough control. the tetrahedron of echo can also achieve things like repeating/amplifying virtually anything, such as attacks, spells, and all sorts of feelings/sensations, all of which can be useful in combat. Things such as electromagnetic waves and wind can also be manipulated, albeit with more difficulty. 
Further training can allow one to echo tangible/physical material, allowing for multiplication of materials, similar to the octahedron of copy. One can even replicate organic material and have full control over the duplicates of said matter as long as they hold the tetrahedron while giving command, lest the user seeks for the aforementioned matter to rebel against them. In fact, it is so versatile that under proper guidance, it can surpass a pair of octahedrons in terms of capability.
In-universe, Lithuanian border police owns it.
==Trivia==
*It is somehow one of the most stable shanpes out there, albeit one of the trickiest to harness
*It has not been reported to cause harm to any previous user, unlike some other shanpes.
*Goudar the grotesque actively searches for it, yet with little success.
*It typically makes sounds reminiscent of extreme bass-boosting when used.
Category:Tetrahedrons