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I had ran into the frontlines before everyone else, who were still tailing from behind. The explosion happened just a few seconds ago, so Eleanora probably cannot be summoned for a while. She is currently resting inside of my Spirit Orb, and seems to be recovering. By analyzing her a bit, I've discovered a few things about Spirits and how their death and revival works. It seems that the core of a spirit is the Spirit Orb, therefore, as long as the orb is not broken, they won't die. What comes out is something similar to an Astral Projection, if it dies, they need to take some time to recover and build a new one. Although it seems that because Eleanora is quite strong, and has a very powerful soul, her Astral Projection might take less time to recover than other Spirits.