In The Lost Metal, the below quotes are found:
Because of multiple WoBs, we know that investiture is the 3rd (whatchamabucket) along with energy and matter.
What is temperature? Heat energy. This stands to reason that that the changing of states for this metal is more dependent on investiture than other metals.
Because of the following scene where the hemalurgic spike (more invested, as they note) has a higher melting point (although it might be because it’s trellium, not harmonium) I would assume that investiture is opposite to energy, solidifying as it gets more invested. However, I am not sure, so I pose the question:
Which is more invested? Lerasium or the Mists?