In the new PvP Stronghold Map Nika, an assassin, from Guild Wars Returns!
Nika's past is shrouded in nearly as much mystery as Nika herself, though Master Togo has learned a bit about her—everyone knows the master of Shing Jea Monastery. Her mother, in fact, runs the largest Assassin's guild in all of Cantha. Nika killed her first man at age 10, and made her first solo kill when she was 12. She has never murdered anyone, to her way of thinking—assassination is her business, and she kills only to defend herself or her friends, or to fulfill a licensed contract.
https://www.guildwars2.com/en/news/meet-the-mist-champions/