Nice i love event blacks the last one i got was that ninja which i don't use at all (Saki has proven to be as good if not better atm)
Looked Eterna up on the wiki and she seems kinda... meh as far as i've read; her AT is not exactly that high to replace my Oddete and her AW ability is AT speed up... and SAW is healing and attack at the same time for 90 seconds...
I will farm her but she doesn't seem that interesting until SAW'd (that minimum 33 UP for a black mage tho)