Hey there, I have being running Twilight Arbor explorable mode with a couple friends for quite a bit now. We have cleared the dungeon maybe 20-30 times on all three paths and accumulated a bit of experience from doing so. I thought I would share my TA explorable experiences with those who are looking to run TA explorable for the awesome armor or for legendary weapon components.
There are three paths for TA explorable and you will be given the choice to chose after you defeat the Greater Nightmare Vine Boss, they are Up, Forward/Up, and Forward/Forward.
Up path is the one most commonly farmed as it has rather easy bosses but hard trash. Forward/Up is the second easiest path but the bosses are slightly more difficult. Forward/Forward path is in my opinion massively overtuned with very difficult trash and boss fights. You can do the Up and Forward/Up path daily to get 60 tokens in about 1 hr with an experienced group.
Most of the boss fights are fairly straightforward but if you are stuck on a particular fight or just want to read more on the dungeon I do have a rather lengthy guide that I wrote here. It discusses the bosses for all three paths (with videos if possible) and some tips and tricks here for clearing the trash.
Introduction (Path selection, Deadly Bloom farming, Dealing with blossoms)