The CW has released an official spoiler description for the April 29 episode of Arrow.
It’s the 21st episode of the third season and the title of the episode is “Al Sah-him,” (that’s how the press release spelled it at least), which could be a new name for the Arrow. Here’s the write-up with new spoilers:
THE LEAGUE OF ASSASSINS SETS THEIR SITES ON NYSSA — Oliver (Stephen Amell) goes through a rigorous transformation. The League of Assassins sets their sites on Nyssa (guest star Katrina Law), who is back in Starling City training Laurel (Katie Cassidy). When Nyssa realizes they are coming, she arms up to face them alone but Laurel asks Felicity (Emily Bett Rickards) and Diggle (David Ramsey) to help protect her new friend. Thor Freudenthal directed the episode withstory by Beth Schwartz and teleplay by Brian Ford Sullivan & Emilio Ortega Aldrich (#321). Original airdate 4/29/2015.