[To be fair, it is a very large and impressive tree.]

It's as tall as the combined height of all these floors. Were we able to view nature outside it, I imagine it'd be quite spectacular indeed.

[Achilles takes the key hanging from the lanyard around his neck to open the door.]

Instead, it serves as... well, an outpost of sorts. Or an observation tower, I've been told.

[He then steps aside and gestures Cloud in.]

Personally, I generally use it to keep an eye out for anyone who I think might benefit from some company in the moment.