Pope Leo X was the first pope to kill a cardinal, and he killed his pet elephant by feeding him a laxative mixed with gold. He hired 10K soldiers to start the War of Urbino, dividing what should have been a united Christendom against the attacking Ottoman Empire but instead caused war in Europe between Christian nations from Feb 1517 to Sep 1517 (hint: one month before Luther's 95 Thesis in Oct 1517). Oh, and he charged people money (indulgences) to have a priest pray for your sins to be forgiven.
But other than that he was a good guy. LOL
That's not what an indulgence is. A more accurate way to put it would be that he told people their dead relatives would be released from purgatory in exchange for a monetary contribution.
Leo X wasn't the worst of the Renaissance popes. I'm not at all sure that he was worse than the current incumbent.