Quite literally just the inverted version of @/spiralcoining 's temporary host flag we legit did nothing
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A perennial host is a headmate whose role as host/outernaut is permanent. A perennial host may have other roles, but they will always be the host until fusion or dormancy. A perennial host will rarely, if ever, be able to leave front, but they will always at the very least be co-conscious. They will likely have trouble accessing headspace, if they're able to at all.
- Pluralpedia perennial host page