The Devaputra is the essence of Myiasis, the principle of flesh turning other flesh into more of itself. Distilled to its essence like this it is virulently dangerous, ceaselessly copying itself. It eats, it infects and it impregnates until all flesh in a space is more Devaputra.

The Argentonymus is a sort of "abyssal mirror life," life naturally occurring deep inside reflections. Bringing it into the real world requires the refining of silver into its purest essence, where it is prized by cultists of Chazakiel, a fallen angel associated with reflections.

The Embryon is what remains of the prime matter of flesh when all else is stripped away from it. It shambles around, resembling a humanoid- though it lacks every single trait of a human save for 'the flesh.' For alchemists, the Embryon is a blank slate on which to build new life.

The Witsilver is cinnabar, the moon-element of change and mercury as well as one of the four components of the cosmic self distilled into its essence. It is an amorphous metal blob capable of taking any shape, yet is most prized for its staggeringly large intellectual capacities.

One thing we don't want to do with Malvanean is use elements like 'fire,' 'air' or 'water.' Plenty of games have fire attacks. Few games have attacks based on an element symbolizing the process by which the larvae of the wasp turn the flesh of the caterpillar into more wasps.