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| Red |
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| Bosses get their own icons |
For the boss, it's colored red.
Once defeated, it becomes an individualized icon representing the Seethe.
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| Base symbol |
The base symbol is Yoshiro.
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| the flaps are spread out. |
Once you fully upgrade a base, the symbol is the Goddess with the Maiden symbol at the top of the Torii gate. The 'flaps/wings' of the icon are spread out.
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| looks like a seal? or stamp. |
There's also this little Yoshiro that appears after you upgrade a base.
It resembles this kind of art.
Or so I thought. After image-searching on my computer instead of phone, I stumbled across this.
This seems to be the inspiration? I don't understand what the blog post is about though. The translation doesn't help much...
Bonus:
Our other favorite Maiden and her former symbol.