You are wrong. You could have found that out by just googling “Dragon’s Crown skill reset” or “Dragon’s Crown respec”.
In hard mode(or even in normal, I don’t remember) you unlock a series of extra levels called the Labyrinth of Chaos.
There are 100 floors, each floor having 3 short section with one boss each. Floors 3, 6, and 9 will give you Amnesia Elixirs, which allow you to respec your skill points.
You only get them once per each of those floors though, until you get the Ultimate difficulty in which you can get them infinitely from the new series of extra levels replacing the Labyrinth, now called the Tower of Mirages.
It goes on “infinitely”, but you can only get them from floors 3, 6, and 9 again.
I don’t know where you’re at in this game but let me break it down to you.
Normal mode(is really “Very easy” mode): Nothing, a cake walk, basically a long-winded tutorial and explanation of the lore.
Hard mode(is really “Easy” mode): slightly more difficult but still nothing that you should really have trouble with at all unless you’re really doing something wrong with your character. You unlock the LoC, once you beat level 9 of this you get a seal of chaos item that gives you passive buffs to things like damage and defense as well as other things. It gives you more the more levels you complete. If you beat the whole thing you get, if I recall correctly, a 25-30% buff to multiple stats, which is valuable depending on who you use and how you use them.
Infernal(is really “Normal” mode): Nothing much to it, you unlock LoC floors past 9.
Ultimate Mode(The real game begins here): Not too hard unless you go for the story paths, which you shouldn’t do until you get fairly deep into the ToM, because you’ll get slaughtered otherwise, and once you get past floor 500(the floors or one short level each BTW, so it doesn’t feel like as much a grind as the LoC) you’ll start having serious problems and will probably need some help unless you have a really good setup and gear. ToM gives you good loot so you can keep up with the ridiculous difficulty of the Ultimate story mode enemies and bosses.
You say that, but once you get to Ultimate it will be shockingly similar if you’re using a melee character.