Deck Knight
Blast Off At The Speed Of Light! That's Right!
Spiky Tiger in Secret of Mana is hands down the most difficult boss in that game. You don't have any magic when you face it, it's got pretty excellent attacks that can knock you unconcious, and in general it's one bamf. It's certinly beatable, but as far as bosses go that's definitely the toughest for the level you're at when you face it.
Oh course I've beaten Secret of Mana using only the Boy and physical attacks. The only time you really need to revive your allies is against Gorgon Bull, since it has that Lv. 8 Earth Slide that Obliterates a single target (it did 999 Damage when I had the best gear equipped. You need to dilute it by having allies alive).
Those Doom Walls were no prize package either.
Oh course I've beaten Secret of Mana using only the Boy and physical attacks. The only time you really need to revive your allies is against Gorgon Bull, since it has that Lv. 8 Earth Slide that Obliterates a single target (it did 999 Damage when I had the best gear equipped. You need to dilute it by having allies alive).
Those Doom Walls were no prize package either.