By the description of him driving the moneylenders from the temple, we can also tell that he fit inside the temple, which gives us an upper bound as well as a lower bound on his size.
It’s been said that Jesus Christ was larger than a baby but smaller than a temple
D&D is first and foremost a co-operative game and the enjoyment and comfort of fellow players takes precedence over whatever beautiful arc you have in your mind. If you want complete control of the narrative, write a novel.
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If
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you
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want
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complete
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control
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of
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the
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narrative
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write
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a
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novel
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True for both players and DMs.
Corollary point: as a player, it’s your job to be an interesting protagonist in a way that still allows for the GM and other players to also have their fun. As a player if you’re just there to fuck around, not contribute to the story, or act like you’re the main character, go play a videogame instead.
The worst kind of player is the kind who uses their characterization to be a dick to their groupmates. “But my character is just like that” well you made a bad character for this venue, do better by your team. Think about the other people at your table and whether you’re making it fun for everyone, not just yourself.