Answer:
Kills the bad ones and the sad ones. Tightens to fit, so one size fits.
A shimmering field that reaches far. Yet it has no tracks, And is crossed without paths.
What has 4 legs in the morning, 2 legs in the evening and 3 legs in the night?
Pirates put their booty in it.
A warrior amongst the flowers, he bears a thrusting sword. He uses it whenever he must, to defend his golden hoard.
What is so fragile that saying its name breaks it?
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?