Yuusha, Yamemasu - Vol. 2 Ch. 10.1

[Clad95150]

@mahtan : yep, that stone exist... And the humans has it... But for some reasons they don't win the war on the spot, or live in an utopia or anything of the sort (and someone as powerful surely didn't ask for enough power to protect him against robbery)... Eh... These dumbs humans...

I think it's something like @grandhighlazybum said and it'll be linked to Leo somehow.

 

[abconline]

Leo probably killed the rest of the DH series...

 

[Luftwaffles27]

How about a boring theory? Maybe the philosopher's stone is a metaphor for "ancient" technology digitally preserved during the deterioration of the human race? Maybe it's related to terraforming?

 

[kyself]

I miss Meru-chan already.

 

[The5thSeraph]

FTTTOUR

So now she is called "Echidna"?
And apparently Leo wasn't empowered by the whatever stone at all, since he was just made that way.

You know what I hate the most?
Inconsistency.