You can only bring out a certain amount, though often it's more than enough.
When a unit dies, it's EXP is reset (it's level doesn't change, but all EXP gained towards the next level is gone), and they are removed from the battlefield. They are not gone permanently, but the will be down to 1 Morale afterwards.
And it's truly not as hard as you'd think to get sprites.
Anyways, glitch screenshot time. Same thing that happened to Rhea, it appears if you get more than four bonuses, it will do this. Anyways, before the picture, what happened: (Very, very, VERY mild spoilers for BF32, really just the type of enemy)
» Click to show Spoiler - click again to hide... «
Sent Kylier (it's always Kylier's fault) up against a dragon, with dragon killer. She got a critical, and - I wasn't even thinking about the glitch, I just wanted to be sure it would die - I activated Dragon Killer, for the Dragon Slay bonus. So, that's Critical, Head Alive, Dragon Slay, and Equipment. After it listed all the four bonuses, it CONTINUED listing, over and over again, "HEAD ALIVE" all the way down the screen. Then, when the screen updated to show his empty circle, it was instead, filled with "HEAD ALIVE" over and over again.
HERE you can see my crappy picture of it.
Писатель всегда будет в оппозиции к политике, пока сама политика будет в оппозиции к культуре.