Finally taṭastha-sakti is correctly understood as another name for marginal living entities who are inbetween the Spiritual energy and the material energy.
Srila Prabhupada - "So this material world is the taṭastha (conditioned) characteristics, and the spiritual world is the "personal" characteristics. So our effort is to get out of this taṭastha (conditioned) characteristics and to enter the permanent characteristics (Vaikuntha). That is called spiritual elevation". (Lecture on CC Madhya-lila 2

Ekadashi Seva