[quote=@Jabber]
[@KoL] I think it wasn't specifically mentioned, so I'll take a shot at it. Could the vessel be a living thing or transform into one? Maybe a puppy that turns into a wolf or a pendant that turns into a hawk?
[/quote]

The first option wouldn't work, but the second is possible, though it could be more like a pendant that becomes a falconer's glove that can summon a hawk with its power.