On the trip down from the archer, I hop off half way to find Ser Chubby sitting along the balcony quite confused as to how he got there. He's also quite afraid of a large flaming demon in the distance. I use my tried and true method of archery from where the monster can't reach me - but this forces Ser Chubby into action, charging the demon in close quarters. He can certainly hold his own though, and almost single-handedly slays the beast! After sharing a drink in celebration, he takes a little nap while I continue exploring, eventually making my way to a huge plaza where hollows seem to be worshiping a huge, misshapen tree.
Oh... it's not just decor.
This horrible thing is a boss, and much like the previous tree boss requires hits to land on it's cancerous sack weakspots. It's much more agile than the last tree though, which catches me by surprise. My 2nd attempt goes much better, where I use its own attacks to squish it's own, endless adds. Eventually it breaks the floor into a large underground pit. Despite the change of scenery it doesn't actually gain anything new, making it an easy kill.
Protip: Don't let giant foes pick you up. :P
Returning to Firelink Shrine to level up, I talk a bit to Yoel who offers to "draw out my true strength" which translates to free levels! Yay! There's also a new, tricorne hat wearing guy named Leonhard here who gives me a key to a lift at Lothric's High wall and asks that I slay the Darkwraith at the bottom for him. It happens to be a very short mission since there's a bonfire I can warp to nearby. Also since the skeletor has the exact same moves from the ones in New Londo Ruins, I make short work of him. This impresses Leonhard who suggests I join Rosaria's fingers at the Cathedral of the Deep. Sounds like a fetish cult.