mrkgnao: That's the article I had read before asking my question, but that sounds like a lot of other action RPGs, e.g. diablolikes.
That's actually a very a good point.
Most of the things that Dark Souls is commonly credited with having invented, it actually did not invent, but rather, it took existing mechanics from other, earlier games, and then varied them somewhat.
Losing your souls - which are the resource you need to level up and therefore to boost your stats in order to make your character more survivable - in Dark Souls is really just a variation of the idea of, upon character death, losing some or all of your experience points progress towards the next character level in Diablolike games.
The bonfires in Dark Souls games are nothing more than a variation of Diablolike games' waypoint system.
And the estus flasks in Dark Souls are just a variation of life potion and mana potion flasks in Diablolike games, etc.