Oh man, Vagrant Story by Squeenix. I played it in my teens, couldn't get it. Played again in my 20s still not clicking. I remember getting to this dragon thing and just failing utterly miserably to do any damage. It had some really counter-intuitive systems in the combat, like chained attacks would get weaker, you'd hit for 30hp on the first strike, then 20, then 10, by the fifth strike you were doing 1hp damage on a creature that had 1000s.
It's a shame cos I loved the world and the crafting and what not, but the combat just didn't go in to my brain.