I've been really enjoying Grim Dawn
the past few days. A diablo-esque loot crawl from people who made other games like this in the past. It's especially similar to Titan Quest, since it's based on the same engine and created by the same lead guy.
It's consumed my life for the past few days, and it's rare that a single player game keeps me interested for any length of time (it supports four players, but I've been playing solo). If you like isometric action RPGs, I recommend it.
It's $25 on Steam, but I got it for $10 through the Humble Monthly Bundle:https://www.humblebundle.com/monthly