Answer:
I rise and fall no matter what, only at finals rest do I not budge. What am I?
One simple click, one simple flash. A piece of memory, for years I'll last. What am I?
A single syllable do I claim black was my most famous name; Fetal to mortals here below thousands have I slain in a single blow.
I can be entertaining until you realize some pieces have been lost.
I am a small paradise surrounded by dryness and heat.
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.