"Battle Royale - SiIvaGunner: King for a Day Tournament" is a high quality rip of "Battle Royale" from SiIvaGunner: King for a Day Tournament. It represents the King for a Day Tournament contender Thanos.
This is a trap-style remix of "Lobby (Seasons 1 & 2)" from Fortnite that takes on the melody of a section from the theme to the Avengers movies. At 0:04, Peter Parker’s "Mr. Stark, I don't feel so good" line from Avengers: Infinity War is quoted. The rip ends with a single snap, referencing The Snap at the end of Avengers: Infinity War.