Answer:
A precious fluid, thicker than water.
Born of earth, but with none of its strength. Molded by flame, but with none of its power. Shaped
My first master has four legs, my second master has two. My first I serve in life, my second I serve in death. Tough I am, yet soft beside. Against ladies cheeks I often reside.
Without a bridle, or a saddle, across a thing I ride a-straddle. And those I ride, by help of me, though almost blind, are made to see.
Slayer of regrets, old and new, sought by many, found by few.
What flies without wings?
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?