dtgreene: Paladin's Quest's final boss:
* Is much stronger than anything else in the game
* The boss can be particularly dangerous, with two actions per round; it's quite possible that the boss can take you down from full HP to dead in a single round, and there are no mid-battle revives.
* Only one of your characters can do meaningful damage, and doing so costs 250 HP. (You might typically end up with around 1500 on him by end game.)
* Is actually the second part of a compound boss (the first part is not so bad), which is at the end of a fairly long trek (though at least you get a bottle refill shortly before the final boss).
The only saving grace here is the Gigabl item; there are 2 of them, there are 2 characters who can equip them, and each one has 9 uses (refillable, but obviously not in the middle of the boss fight); when used, it fully restores the HP of every living party member. Unfortunately, one of them is permanently missable (one of the worst missables I've seen in an RPG).
(Lennus 2's final boss, on the other hand, is perhaps too easy; the game even gives you a mid-battle full revive, but in practice you don't actually need it here.)