Agree here, more action RPGs would be nice to see on Stadia.
I doubt though that Diablo would ever come to the platform as the developer (Blizzard) wants people to use their own Launcher-service and it's also not coming to Steam or other platforms, so I guess that will not happen.
So far I think indeed Darksiders Genesis is probably one that you might enjoy, it works a bit like Diablo, you slash through enemies, you have a bit of story there and you sometimes have to fulfill little actions/puzzles, e.g. specific jumping/flying at specific points to reach the other side for example, which feels nice in the game.
I think the other games on Stadia so far are not really ARPGs so far, maybe Immortals Fenyx Rising is close to it, but it's more a story-telling game I would say than a pure hack-and-slay adventure.
But maybe 2021 we can see some more of this genre on the platform, would be great!
