Eiro found himself in the mental library, but he wasn't alone. Of course the mental duplicates were there, but Eiro didn't count them as other entities, in the same way that he did with the ones on the plane of Water or Fire. Those two quickly appeared in the imaginary space themselves, as the three of them looked at each other.
"So... what exactly just happened there?" The Eiro from the water plane asked, but the original quickly shrugged, "I don't even really know. I don't think that's a stealth ability..."
"Well yeah obviously, but if you want to be that stealthy, you need a ridiculous amount of control over your body. It makes sense that he'd be that strong," Flame Eiro pointed out, "Though it's still ridiculous that he managed to overtake you... us, like that, even with that strengthening spell active."