A caped entity with two intersecting tetrahedrons for a head. The cape is held up by a spiked platinum collar. To the entity's left is a description: Stella Octangula - Summon by placing 8 tetrahedral objects in a cube with hexagrams drawn on each face, then shake vigorously - Teaches hyperbolic geometry - Becomes two Tetrahedrons if forcibly separated
Polyhedron compounds are notoriously difficult to summon (the Stella Octangula is the simplest type). Should the summoner succeed, they could answer unsolved mathematical problems. Assuming they don't go mad from learning how...
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