Best delve to use to farm?

[Sytro]

Check @Nullings topic:

Delves: all about rooms and plans

Here I show all delves’ plans: rooms and passes between them. Before we begin, I need to introduce some things. Introduction. In this topic you’ll see delves’ plans with rooms. All delves have 9 rooms (except All-Seeing Eye, which has 8 rooms), 2 of them are always “faction start” (always level I) and “faction finish” (always level VI) and consist of faction troops. Between start and finish we can see other 7 rooms with different levels and bonuses. You can see all these rooms here: Delve Room…

look for delves that have a lot of treasure rooms… and a lot of IV / V rooms.