Zhentong [shentong].
From Wiki:
Shentong [...] empty of all qualities other than an inherent, ineffable nature [...]The short is that it is empty of falsehood, not empty of its true, innate, perfect nature of Buddha-qualities.
According to a Shentongpa (proponent of Shentong), the emptiness of ultimate reality should not be characterized in the same way as the emptiness of apparent phenomena because it is prabhāsvara-saṃtāna, or "clear light mental continuum," endowed with limitless Buddha qualities.[1] It is empty of all that is false, not empty of the limitless Buddha qualities that are its innate nature.
Trying to grasp the ungraspable (ineffable) can be a hindrance. Speculating about it might lead to madness (see Unconjecturable Sutta)
One would certainly need to exercise great vigilance and care regarding this.