Not too far into my first campaign, I played a Hexblade warlock with a level of sorcerer for some extra spell slots / CC spells. We get ambushed by some bad guy guards trying to rob us. As they’re stalking us in the bazaar we were shopping in, the initiative rolls begin out of nowhere. Roll a nat 20 for initiative, and end up going first. I cast grease and catch them all in it. 4/5 guards fail the save and fall prone. The 5th guard goes second and shoots an arrow at me, does a few damage. I react with hellish rebuke. It ends up engulfing all of the guards, the hay cart next to them, and half the bazaar into a raging grease fire inferno. I learned to be more aware of my surroundings after that day.

What new knowledge have YOU contributed to humanity?