Zapping Players Towards Mutalos

Players are near Balenpost in the mountains looking for Narthrow Arple.

Come across a stray Gelgulon that doesn't belong.

They find an underground tunnel to a secret cultist lair (following the gelgulon).

They fight through cultists and other devils and reach the end where they are rewards AND

...a portal or other transit method to move way up north near Mutalos (for other plot hooky reasons).

My question is: Is there a fun way to do portal travel or fast movement travel long distance that's challenging and rewarding? Like riding enchanted gargoyles or keeping their sanity or fueling a magic hyper reactor or something?

I'd love to see your ideas. Happy to share more about my plot if you like also. 😋