The discovery of new inorganic materials is sustained by the growth of high-quality single crystals that enable robust characterization of their functional properties and permit structure solution from single-crystal diffraction. The most effective crystal growth occurs from liquids or gases, based on enigmatic growth mechanisms that are especially tantalizing in the grand challenge of obtaining metastable materials by extracting them from an aggressive growth medium. Reactions in molten fluxes can lead to such kinetically-trapped metastable phases unobtainable by direct combination of elements, and these methods have proven to be prolific in producing new chalcogenide materials in particular. These compounds are typically narrow-gap semiconductors and heavy elements lead to strong spin-orbit coupling, which can lead to topologically protected gaps, such as in TlBiS 2 and Bi 2 Se 3 . Given the nascent field of crystal growth for nontrivial topology, the identification and high-quality growth of these materials is invaluable.