I’m thinking 2015 - Witcher 3, Undertale, and Kerbal Space Program are all classics. Fallout 4, Arkham Knight, and Cities Skylines were all excellent too, though fallout 4 and Arkham knight aren’t necessarily the best games in their respective series.
Dark Souls was 2011 and it was way more influential than all those games (except maybe Minecraft).
Demon’s Souls came out years prior.
as a ps3 exclusive that wasn’t even close in popularity but yes most of ds1 was copied from demon’s souls