Three concepts

The Other Side is neither absolute evil nor a mirrored parody of the sephiroth, but a cosmos of its own, issuing from the Primordial Division of Ain. One part of the Absolute (Ain+) contracted into the Tehiru and built creation through the name YHVH; the part that deliberately withheld itself (Ain− / Chasek) activated within itself a creation of another order — acausal, plural, uncreating.

In Stream 190 the Sitra Achra is read as "Universe B": the world of multiplicities (reshut ha-rabbim), free will, and the black light of Aur Shachor. The practitioner does not "descend into hell" but enters alliance with powers that lift the limits and the dead forms of the causal, launching new constructs into Malkuth by the impulse of the Nachash.

Not "husks of refuse" in the pejorative sense, but lesser palaces — the kingdoms of the Tree of the Other Side. After the shevirat ha-kelim the shards of the worlds of Akudim and Nekudim fell into the Masach Mavdil; Ain− assembled the opposing Tree from them. Each palace is a concentration of the light of the Nachash.

The Qlippoth uncreate demiurgic foundations, but they do not destroy matter as such: by introducing an acausal element into the causal, they bring forth new forms that already carry the impulse of the Sitra Achra.

Literally "strange service". In rabbinic literature, the forbidden cult of the Other Gods. In Stream 190 it is legitimate latria to the gods of the Sitra Achra: a partnership, without servitude, without tithes, and without self-abasement.

Historically these are the cults of Canaan, Phoenicia, Mesopotamia and Persia, erased by monotheism.