Nobody will steal your spirit companions from you no matter what their experience level.
To unbind a spirit, one must know the process in which it was originally bound, and have the ability to deconstruct it. Since master conjurers never disclose their proprietary binding methods, the possibility of someone deconstructing and stealing your bound spirit companion is virtually impossible.
Additionally, well-experienced people (such as conjurers) have no need to steal spirits as they can conjure them at will.
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