Psychic element can be some particles of energy that present in world environment.
Or it can be part of beings mental system.
Psychic element can manifest emotions energy or something similar .
It can be will power , emotions , pure mental waves , or esoteric manifestation of natural classic elemental forces and etc.
In some worlds magic or psionic can be present as particles of immaterial nature that fill whole environment in world element there have meaning ad element of world power system