Your blueprint is the creature. So long as you have at leat one of your creatures alive, you can summon/create/breed as many copies as you want (within reason, you need infrastructure to maintain an army, resources to equip it, and power to summon it). If you lose every last copy of a creature, you can't summon more. You have to make a new blueprint.

And yeah, there I was thinking my entry was great. Then along comes Jay with one of the best entries I've ever seen. Oh well, I have more characters to introduce. :cool

Speaking of which, I figured out what I want for my Rogue Being. I'll make an entry for him soon, and then he can go find and serve the Keeper of whoever wants him.