"War" Words

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Across
  1. 1. Capital on the River Vistula.
  2. 3. Buffett of Omaha.
  3. 4. Prison boss.
  4. 5. Magical character class in "Dungeons & Dragons".
  5. 6. Verruca vulgaris is the common one.
  6. 7. Andy whose art really "popped"?
Down
  1. 1. Tour sponsored by Vans.
  2. 2. 2016 movie based on a video game.
  3. 3. A portal in a 1950 book.
  4. 6. Sing shakily.