The Order

[splat44]

Interesting, I thought of third ending like:

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Making that king as an imposter by using following items on him:

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Peasant cloths and two item as in (2nd ending)

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Obviously since main player is invisible and changing cloths is only done by right clicking (use), on further games, you might want making main player visible (walking animation included) so items be used on characters perhaps?

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@splat44
The story reveals itself in dialogs, also some puzzle clues, (deliberately as subtle as possible) which are mostly repeatable till puzzles are solved.

About the second ending:

Spoiler

As mystic suggests you can abduct the Prince and leave the order. Look at your inventory and see which items help you with his abduction.

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