The Skull Reaper

The Skull Reaper was the boss of Sword Art Online Floor 75.

Background
Prior to Kirito and Asuna's return to the Knights of the Blood, a party of twenty-member from five different guilds was preparing for the boss fight. When the first ten reached the center of the room, the entrance closed. The gate reopened five minutes later and neither the ten players nor the boss was seen. Like the previous boss, the battle area was also in an anti-crystal field, preventing the ten players from exiting the room.

Abilities
The Skull Reaper is the most lethal of the bosses seen so far, easily claiming the lives of 24 players before being slain. Despite being weaker than the Fatal Scythe, Skull Reaper inflicts far more damage, being able to kill high-level players with one hit, and even forcing Asuna to assist Kirito in blocking its scythe arm (though Heathcliff could easily block the other one by himself). The Skull Reaper, befitting its centipede-like appearance, was able to move very quickly to outmaneuver the players, making it extremely difficult to avoid being hit by its attacks. Its huge and long body also makes it difficult to avoid the creature's strikes.

Kills

 * 10 players were killed during the recon of the Skull Reaper
 * 14 players died during the second attempt of clearing the floor