What is the best way to farm glory?
Depending on your level it might be killing revenants. Killing revenants with a significantly higher level yields several 100 Glory (people reported up to 600, highest I've personally seen and remember was 388) and you can still kill them in a few seconds. Though if your level is too low you are less likely to see high level revs and I'm pretty sure there is a gap in the distribution, there is the large cluster of normal people that finished the game around level 200-300 and then a smaller cluster of 750s, with fewer revenants in between. You basically have to either be below the first cluster, or at least in the 300+ range to see enough 750 revs.
Good spot for player revenants is usually Isle of Demons (NG+) since this is where people die to share their gear. If you farm revs there you will also get gear with desirable rolls, like (inheritable) Change to Attack A, Close Combat Dmg +15%, Attack +20 etc. Revenants reset every ~5mins or so, means you can reset them by praying at a shrine (or dying) and don't have to finish the mission.