Vital Core has a close affinity to the "sacral gates" (energy receptors just below the lower back) and therefore has a rekindling effect on the Ming Men. Vital Core helps to clarify shadow aspects of the 2nd chakra, and so this combination can be seen as a useful adjunct to Defender of the Source. These essences are all related to the increased need for awareness of the soul's true purpose without the clutter of the baggage which we invariably carry.  This essence is combination of these essences:  Defender from the Dark, Vital Core.