Don Expresso

 appears during the Mithril Gourmand event, located at in the Dwarven Village. He asks the players to bring him 200. If he isn't fed in time, he falls to the ground and eventually disappears. If he is fed, he lies down and goes to sleep. One minute before  disappears, the following chat message appears:

On interaction

 * THIS ISN'T WHAT I ASKED FOR! BRING TASTY MITHRIL TO ME NOW!
 * THIS OLD MITHRIL IS STALE! DON'T EVER FEED THIS TO ME AGAIN!
 * DISGUSTING! I'M GONNA GET YOU FIRED FOR FEEDING ME THIS GARBAGE!
 * EWWW WHAT IS THIS?

Waiting for food

 * I HUNGER
 * BRING ME EDIBLE MITHRIL
 * I FORGOT TO BRING A SNACK
 * 0/10 WOULD NOT RECOMMEND, TAKING TOO LONG
 * WHAT ARE YOU GUYS WAITING FOR
 * I AM LEAVING A BAD RATING FOR THIS PLACE ON MINEADVISOR
 * I WANT TO SPEAK TO YOUR MANAGER
 * THEY LOOK SO GOOD
 * I MIGHT JUST STAY HERE FOREVER
 * DO YOU EVEN KNOW WHO I AM
 * MY FATHER WILL HEAR ABOUT THIS
 * WHY IS THIS TAKING SO LONG
 * I AM RATING THIS ESTABLISHMENT ONE STAR ON DWELP
 * I DON'T HAVE ALL DAY, I ONLY WANT THE BEST MITHRIL PIECES!
 * MY MEALS SHOULD HAVE ALREADY BEEN READY
 * I AM NOT HAPPY WITH HOW LONG THIS IS TAKING
 * I AM NOT OKAY WITH THIS
 * I DON'T FEEL SO GOOD...

After being fed

 * I THINK I MIGHT HAVE ROCK POISONING, I NEED TO LAY DOWN!

Trivia

 * If Don Expresso is given Tasty Mithril from the a previous event, the Tasty Mithril will be wiped from your inventory without counting toward the event and display a chat message.