Ducker

Ducker (ダッカー) was the member of the «Black Cats of the Full Moon», a small guild in «Sword Art Online». He was killed along with most of his guild when a trap was triggered that called multiple of monsters out and prevented the use of teleport crystals.

Sword Art Online
Before being trapped in the virtual world of Sword Art Online, he was part of his school's tech team. Almost every member of the team entered the virtual world, and there they formed a guild. One day, while they were on the losing side of a monster battle, Kirito rescues them. They were thankful of the action and decided to request the beater into their guild, not knowing his true status. Kirito accepts. Few weeks after he joined, the guild explored a unexplored area of a dungeon. A triggered anti-crystal room set monsters upon the under-leveled players, and he was killed along with his guild, the only survivor was «The Black Swordsman».