Sentry

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A Sentry is a headmate who is co-con at all or almost all times, both to watch over front and to protect the system when needed. This is a type of protector role. It can also be considered as a caretaking role as well if the sentry is also a soother, or other similar role.

Related Terms
Sentries are similar to observers, however a sentry is explicitly also a protector. They may also be a silent watcher.