Answer:
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.
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When it comes to me, you go on red and stop on green. What am I?
I have two bodies joined together as one. When standing still, I run and run. What am I?
I go in hard, come out soft. Blow me hard and I'll make a pop. What am I?
It comes from crystal and melts to a treat. Add it to your tea to make it sweet. What is it?