Sephtis tends to cough up blood after exerting too much of his power.
This usually only happens if he lets a soul wander the mortal realm for a long period of time.
Depending on how much power he uses, his blood will be either pink or black.
Pink blood indicates just a slight bit longer than
usual.
Black blood is more concerning. That alone weakens him greatly.
Hopping around in his bird form, collecting a variety of different flowers.