Arthas Mentallis

Arthas Mentallis was a Jedi Knight who fought during the Clone Wars. He led a mission against the Sith Ship Might of the Sith commanded by Gangru Morpir and he was the only one to survive the mission, striking down Sith Lady Darth Verona before she could destroy the whole ship. He escaped but the dark side energies consumed him and he plotted to kill Count Dooku himself, threatening to tip the tide of war further into darkness.