Lillikoi: Yes, and the character in question [Kanna] has completely turned to crystal, and Kanna's [beloved? soulmate?] partner Satori is now about to find the Tree of Life in the hopes of reviving Kanna somehow.
Kip: The 'dark turn' involves a character [Tenya] who survived the legendarily horrific 'starfall', in which a star maiden crash-landed on the planet and incinerated anyone both nearby and in the vicinity.
I'm not quite done, but Satori and Tenya are close to the crash-site of the star maiden, and below that is the Tree of Life [which is actually the star-maiden herself].
A mega twist involves seeing the entire book from a whole new understanding, and a normal twist concerns character identity.
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Quote:
A memory is something that has to be consciously recalled, right? That's why sometimes it can be mistaken and a different thing. But it's different from a memory locked deep within your heart. Words aren't the only way to tell someone how you feel.” Tifa Lockheart, Final Fantasy VII