ISuMin
Describe yourself
of reading
606
Read books
If he's going to assimilate almost every bloodline he comes across then it will be too exaggerated to write all of it. You can think of his the most used and the most powerful abilities in each category (movement, attack, defense and so on) and write them down, explaining them more thoroughly than in the chapter that they are used in to make that auxiliary chapter worth reading.
Dangerous. Not cool.
The ancient practice.
Though don't assume the indifference for inaction, since the dog dares to bark it had to be punished.
I wouldn't say that a person like that will be cold, rather indifferent since he did already achieved almost ultimate power. It's like a bored demon lord looking at the filth.