Swim to the bottom, and look for any caves with a boss monster

You swim to the bottom, then find a path that branches off the main well, following it you find a boss…jar?
What do you do?
Swim to the bottom, and look for any caves with a boss monster

You swim to the bottom, then find a path that branches off the main well, following it you find a boss…jar?
What do you do?
Address the jar.
P.S.: indignantly.
defeat the Evil Boss Jar
start talking to it as if it was alive
Use your insanely-many-Elf-years-that-recently-got-added-to-your-life to ponder, “Why is there buttons on that rock over there?”
Understand that this jar is Joshua’s cousin, Jessica.