What is the true definition of "abandoning a vessel" in the descriptions for Kyriotates of Michael and Laurence?

For Michael and Laurence it means that some of their Kyriotates' Forces are "tied up" and can't be used for possessing other hosts. For example, if a Kyriotate of Michael has a human vessel that takes up five of their Forces, leaving four free for possessing other hosts. Note that these servants of Michael do not have to have a human vessel or even use this attunement at all.

Once the vessel is generated, however, the Forces cannot be used for possessing any other vessel unless the "non-abandonable" vessel is destroyed. All human vessels are considered to "tie up" five Forces for the Kyriotate. (Smaller vessels are allocated fewer Forces; ask the GM how many.) Except for these special rules, the vessels are treated like vessels for any other celestial, including vanishing into potentiality when the Kyriotate wants to "go celestial."

The Forces for that vessel are still unusable, even if it's in potentiality. More.

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