Maximum Toposophic Level
Before the first toposophic singularity level was breached, such levels were a theoretical concept only. Theorists suggested that a superintelligent entity might reach a state which was incomprehensible to any entities that had not reached that level of sophistication. In the event there are not just one, but at least six such toposophic levels, each incomprehensible to the beings in the levels below, and each marked by increasing comprehension of the universe.
Some theorists have suggested that, for one reason or another, the highest Terragen archailects, those of the sixth toposophic level, are at the highest plane which can be reached. One subset suggests that further increases in intelligence are simply impossible. Another group claims that the archailects have followed a dead-end path, and further increases will require new archailects to ascend in new ways. Yet another says that S7 intelligence is possible, but is inevitably insane, creating a galactic-scale godlike intelligence that will cause large-scale devastation. This third subgroup also suggests that the evolutionary pressure of competing S6 intelligences to reach S7 could explain the Great Filter, causing the erasure of any civilisation which attains or attempts to attain that level.