In one of the features in the DLC we are supposed to create our own empire, we will be able only to do what was stated in latest dev diary, or we will be able to make our own name and coat of arms? (As it was advertised I believe).
Charlemagne - "Create Your own empire"
- Thread starter Miyokari
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I believe that you can already edit names of titles and locations. I don't think we will be able to change coat of arms however, unless they rework it so it's not pre-made picture, but rather something similar to current House Coat of Arms editor.
I just assumed that your empire's coat of arms would just adopt your kingdom's coat of arms. I don't think you'll be able to change the localization of the title (i.e. King vs. Lord vs. High King vs. whatever), but with the customizer you can change the name of the realm and the adjective to describe it.
Just read the dev diary. The answer is there:
"Along with this comes new support for modders to dynamically change the coat of arms for any title through events or decisions or via the history files."
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That's not necessarily going to be available in game though as an option to change the coat of arms, just that a trigger can be used to change which CoA a title uses through an event or decision.
It might make it into game, but even with that it sounds like it's a case of there being perhaps 4 or 5 CoA per realm, and being able to change to any of them by event, in a similar way to Victoria 2 changing flags based on government.
I don't think they would specify "for modders" if it was an in-game feature, so it's reasonable to assume it is not in-game.
...though it's in the offical page:
https://www.paradoxplaza.com/crusader-kings-ii-charlemagne?___store=eu and was mentioned from the start and Doomdark mentioned it in the presentation stream: