94. The Crystal item Goilbez gives to Cecil is a bit of a mystery in FFIV. We are never explained it's significance, how Golbez acquired it, or why it triggers Zeromus' final form. The closest explanation we get is that the player can infer that the crystal gives Zeromus a physical form.

95. Interestingly enough, while the narrative makes a big deal about Golbez being unable to use the Crystals power to stop Zeromus due to his heart being of darkness, but funny enough, in the game's code, the Crystal is actually dark elemental. Which is especially funny because there are very few things in IV that possesses this element. The only other items/abilities that possess this element are Cecil's Dark Knight swords.

96. Speaking of unsolved mysteries in FFIV. We know almost nothing about the Tower of Zot. It is one of the rare locations in IV that cannot be revisited when completed and it actually has no physical location on the world map. We know it's in the air. One popular fan theory is that the Tower is a reference to the Sky Fortress from FFI seeing how both are locations found only in the sky and house a Wind affinity Elemental Fiend. In the 16-bit version, the tower uses the same interior as the Tower of Babel, so it's very likely the Tower of Zot is of Lunarian origin.