I was running Shisui of the Violet Tides earlier, and my playlist came up with "Murmaider 2: The Water God" by Dethklok, and I laughed so hard that I got punted by the second boss.

Then I got Nidhogg in trial roulette and started hearing "On a Sea of Blood" by Amon Amarth ("Nidhogg comes on wings of burning flame/Cast down war and endless pain").

I think my playlist supports this idea.