Actually, the Crystal Tower is something else entirely, not the piece of Dalamud that stuck in the ground.
Spoilered because, well.. ...it's kind of spoilerish? I guess.
The key, on the other hand, is supposedly going to have a significant part in the 2.0 storyline, and my personal bet is it on it being located within Bahamut's Labyrinth. Just my two cents, though. Might be best to be cautious of tying a character to such a potentially volatile piece of lore. We just don't know what happened to it, where it currently is, what surrounds it, or what it even is to begin with. Could be incredibly dangerous, in an impossible to reach place, etc.
Spoilered because, well.. ...it's kind of spoilerish? I guess.
The key, on the other hand, is supposedly going to have a significant part in the 2.0 storyline, and my personal bet is it on it being located within Bahamut's Labyrinth. Just my two cents, though. Might be best to be cautious of tying a character to such a potentially volatile piece of lore. We just don't know what happened to it, where it currently is, what surrounds it, or what it even is to begin with. Could be incredibly dangerous, in an impossible to reach place, etc.