Final Fusion

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Final fusion is the process during which a system fuses until there is only one headmate in the body; essentially, becoming a corelet. The resulting individual may be a sum of all headmates that previously existed, or see themself as completely unique. Some systems may finally or fully fuse by accident, while for others, it's a long-term objective they work towards.

Since fully fusing requires complete integration among all system members, including all traumatic experiences, final fusion may take a lot of time and require "fully" healing any trauma a system has experienced.

History
Final fusion is one of the potential goals of healing for some disordered systems, with resolution being another. While final fusion was regarded as a necessary final step of healing and measure of therapy success in earlier treatment attitudes, publications also report that finally fused patients are "unstable" in their fusion and may re-split easily.(Kluft) Therapists have also pressured patients into pursuing final fusion, or dismissed their wishes to attain resolution.(Haunted Self).

Over time, resolution has become a more seriously considered alternative to final fusion by both disordered systems and professionals.(treatment guidelines) This is in part due to intense effort required by many systems to reach final fusion, the instability of the resulting state, the infeasibility of achieving final fusion for systems that are severely traumatized. Instead, systems with large member count may aim to "fuse down" to a more manageable number.

Final fusion has been the focus of many debates on "valid" forms of healing and is am uncomfortable topic for some systems.

Related Terms
Final fusion is not the same as when all walk-ins leave the system; those headmates have not fused, just left. It's also similar to system collapses, but like the former, does not necessitate fusion.

The headmate resulting from a final fusion can also re-split, becoming plural again; a version of this can be seen in bombogenic systems, system resets, and other origins.