I've been trying to fight the final death rite bird found in the consecrated snowfield. The previous one was doable, but this one isn't just tougher, but it's also right in range of Touhou's Moving Castle so every time I got assblased by a hail of magic. Luring it to the cliffs to be out of range of the castle is tricky as well because it leaves me with no room to maneuver around. Might take a while.