The Glyph Tower can be accessed through the secret treasure room after you've found at least 6 secret tresures. A portal that you can enter will appear in the middle of the secret treasure room and ...
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All glyph locations in Assassin’s Creed Shadows — how to unlock the secret door
Unlock the secret Isu door in Assassin’s Creed Shadows by collecting all 13 glyphs scattered across Wakasa, Yamashiro, Omi, ...
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