Sorry for late reply, ya I bought like 5 chests from each of the different chests. I hope they change it to crit damage, and give him crit chance skills.
I did use Talnac but I then I decided to get Nyxx, I like her but I miss Talnac's healing that actually lasted 5 seconds instead of nyxx's one time healing.
My best guess is that the castle in Jaral is a 3 star mission, the only 3 star mission in the whole game, but we don't know for sure until the next big update.
Plus I use Nar'Ghal with 767 ATK and 689 DEF, Kassia with 583 ATK and 562 DEF, Tlanac with 493 magic power and 631 DEF, and O'da with 777 ATK and 468 DEF, and I can only do the 1 and 2 star headhunter missions, the 3 star is way too hard, the first 3 star boss really kicks my ass.