The Skull Reaper

The Skull Reaper (ザ・スカル・リーパー) was the boss of Sword Art Online Floor 75.

Background
Prior to Kirito and Asuna's return to the Knights of the Blood, a twenty-member scouting party 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 boss room.

Abilities
The Skull Reaper is the most lethal of the Labyrinth bosses seen so far, easily claiming the lives of 14 players before being slain in battle. Despite being weaker than The Fatal Scythe, The Skull Reaper still inflicts large amounts of damage even with short combo attacks, being able to kill high-level players (the higher the level of a player, the more HP he or she has, making higher level players harder to kill despite their actual combat skills) with just one hit, and even forcing Asuna to assist Kirito in blocking its scythe arm (though Heathcliff could easily block the other one by himself, but he was using the system assist for it). 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 75th floor