Each of these items represents the soul of a man or woman you destroyed on your way to power. And you kept them in a trophy case. Let's be honest David, you've been a monster like me longer than you'd like to admit.
Alex: What the hell is this? Michael: It's the amphora of Darkness. Brings out the darkness inside and drives you mad with visions to make you hurt yourself or someone else. Some are nightmares, but some are dreams. Beautiful but fatal. All end in death. Alex: Well I'm not seeing anything. Nightmares or dreams. Michael: Neither am I, but angels can withstand its effects longer than humans. Doesn't explain you though.