To even begin you must reforge a broken legendary blade. Which is used to split open a mountain in your way. Next is the castle where the boss is, giving you a full view of it along with bats and full moon.
More than 100 enemies stand in your way, along with 3 boss fights and several traps and tricks. You'll have to come prepared or your supplies can quickly dry up.
Then you get to the boss room and the music cuts. You slowly walk forward and flames light up along the path. Soon enough you get to the boss and exchange words. Soon, the music starts up and you can hear the wind. "The black wind begins to blow..." And the fight is on.
I am of course describing the boss fight with Magus from Chrono Trigger. The fight had such build up to it, a feeling of "Yeah I'm going to beat this guy!" The last few hours have been building up to punching this guy in the face and when you get to him, Magus is no pushover. He'll pull out AoE spells, keep changing his defensive barrier to spells, and slap the party with a HP loss effect that can't be purged. Magus just screams out high tier boss fight to me and continues to be a favorite of mine.
Kinda sad he(and most RPG bosses) didn't make the list.