Be aware that the nature of the die roll system can make some fights highly variable, even with the same characters. For example, when my party reaches level 3 or 4, I test them against enemies that can prove a challenge at those levels (no spoilers). I give it about even odds that my party will trounce the enemies in two to three turns, with no one taking a dirt nap, or that I'll lose 3 of my party members in the first round with my remaining character less than one healing potion away from being knocked out.
Some people love that aspect of the game (as did I, back when I played table-top D&D). Nowadays, I save before and after every major fight.
