I am a plant youuse in food, and my name consists of 5 letters.
Remove the first letter of my name, and you'll get a form of energy.
Get rid of two, and you'll get something necessary for life.
Scramble together the last 3 letters, and you can drink it.
What am I?
Used to threaten, used to defeat. Sometimes it grows, sometimes it shrinks. Used to conquer, used to protect. It marks your downfall, it marks your success. The true god of war, the creator of mess. What is it?