[quote=@Kho]
[@BBeast] If the IC says that it is the tallest mountain on Galbar, I'd assume that it is indeed taller than Mount Bormahven. I'm assuming that mountains so tall won't be great for Galbar's balance though...won't it like, tip over because of the weight, or have a wonky spin or something? Maybe that's why it needed so many moons, to balance out the imbalance such huge mountains would create.
[/quote]

For the existence of such mountains, I would like to point you towards Vestec's contribution to the Codex, which encourages the development of such anomalies.
However, if the Solitary Mount is indeed stratospheric in height, then you probably won't be getting any visitors any time soon. If people can barely make it to 8km without breathing apparatus (Everest), then they'll have no hope of ascending to the Whirlpool on the peak. Even Heroes need air to breathe.

As for balance of Galbar, there is no problem at all. The radius of Galbar is about 6000km (if it's Earth-sized). 20km is but a tiny fraction of that. The difference in density between ocean and continent would have a far greater impact on the center of mass than any single mountain.
In fact, there exists a case study for mountains so big. Olympus Mons is 22km tall, on Mars, which is notably smaller than Earth. Mars seems to have no problems. (Granted, Olympus Mons is a massive shield volcano, so flat that the curvature is nigh undetectable, while these two Galbarian mountains would be much more pointy, but again I indicate Vestec's contribution to the Codex)