Joko's Ninja Exchange rewards!

"The second thing you’ll need is an ancient, mystic Shadowknight artifact called a Tao. The method for their creation has been lost to time, but we Raven Ninjas still know how to use their power." - Fiona, Raven Ninja Weaponsmith

Looks like you make Tao items as well. I dont know if anyone has worked out how.

To me, that says you can't get Taos from the Raven exchange quest, because they don't know how to make them. You have to get them from another source. My own opinion is that Ridley may be a source of them with the Ridley Stone "gach". This would tie all of the Crimson forged weapons and the Balanced Fury star to iTCG, even if they can be forged by Raven Ninjas.

It's also quite possible as others have mentioned that Taos will be more prevalent with another expansion of CWK with the Alchemist and Versalian Grandmasters. But I still think Nexon would want to tie the new items to sales of iTCG set 4, so I think my first theory is better. ^^