Fusion

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Fusion is the process of two or more headmates or fragments becoming one. The resulting headmate (sometimes referred to as a "fusion" themself) often has traits of both, but not always balanced. Fusing is not inherently bad or good, and can result in increased stability for the whole system; in the end, though, the choice to pursue large or small scale fusions is often a private matter and is up to every individual system.

In large systems, especially polyfragmented ones, fusion is often common and accidental. Fragments often coalesce into well-rounded headmates. However, some systems force members to fuse together without one or both member's consent. This is considered inhumane and is often the result of pressure from external sources, especially doctors or fellow systems. To the rest of the system, a sudden integration can feel like the sudden death of a family member or friend.

Related Terms
A non-permanent merging of headmates is referred to as blending, which can sometimes be a precursor to a fusion, and fusiotien systems in which the majority of headmates are fusions.

Fusion is also the last step in the process of integration, or the lowering of barriers between headmates; the lowest the barriers can be is non-existent, after all. The most extreme form of this is Final Fusion, or when all headmates merge together, leaving one headmate that is the sum of all. This was considered the only "cure" for multiplicity and should be handled carefully, as many systems are scared of this prospect.