Howard Terpning, Mystic Power of the War Shield, oil, 40 x 52, Scottsdale Art Auction. ← Previous Howard Terpning, Mystic Power of the War Shield, oil, 40 x 52, Scottsdale Art Auction. Howard Terpning, Mystic Power of the War Shield, oil, 40 x 52, Scottsdale Art Auction.