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As Eustace and the rest of the people began to plant the seeds and pour water on them using the Water Attribute Magic Spell [Water Drop], the split souls' phantoms were positioned above them to watch over their progress.
Truthfully, they were not going to leave them on their own completely, there was a lot that could happen, and it wasn't within their plans to just let them die… At the very least, they would probably act if there was something too inevitable which the Heroes couldn't handle.
Or maybe if someone suddenly dies of sickness, but the two had already released their healing aura over the entire camp, and most sick people or wounded people should be back to normal now, even some people had said that their limbs miraculously grew back, causing a commotion.
Check "The Protagnist's Sister Is Actually the Strongest"!