Yeah this is all messed up. His EX ability is exactly, word for word the same as his devoted defense. Also that defense buff?? If he really gets that much defense then he would be an S++ character
If you didn't get one during the event then you can't ever get one again until it reruns...
But you can use green hero memories but they're really rare, like every 3 months, unfortunately you can only trade the soul medals in mog shop for blue and higher, but every few months there's a chest for about a mil or 500k in an event shop that includes a green hero memory, I think the last time was xmas
yeah been saving for Luartha and Tyrrtus... and still have doubt whether to pull her or Kain... but if its like this, the temptation to pull Kain is reaching boiling point, cant resist him...
Kain for sure if you feel like you have the visore for it. He's limited, and pretty great. Though if you aren't confident in pulling and maxing him out before the event ends, go for Lua instead.