It's been so long I'm honestly not sure of their original provenance. The idea, however, is that intentionality is objectively real, which means that Earwa is chalk-filled with transcendental signifieds--which is basically what sorcery amounts to, transcendental signification, utterances true by virtue of materializing their objects. "Deconstruction" understood as a peculiar, hyper-intellectualized form of interpretation is simply a false theory in Earwa. But the objectivity of signification suggests the objectification of any number of semantic phenomena (after all, this is basically what premodern and fantastic ontologies consist in), including the collapse of apparently true claims into contradiction or aporia. Chorae concretize the collapse of intentionality into contradiction, thus undoing transcendental significations not bound into the intelligibility of the whole, that is, the sorcerous vandalism of Nonmen and Men.
With topos the idea is simply that suffering, as something objective, itself entails an objective toll, one commensurate with the intuitive premium it commands. Too much has the effect of rubbing existence itself raw.