I like it this way. The more you lied, the more you need another lies to cover it up. Although sometimes being honest could f*ck you up, at least everything was clear from the first place.
@wankerlin the whole thing was explained a couple chapters ago. Leo is an automata powered by the philosophers stone. He and a bunch of others were made to fend off the demons that invadr human world. Leo specifically was designed to learn and master just about everything thats why hes powerful.
Read the chapter where Leo talking with the goblin again, there explanation who he is or what his power is.
For anyone lazy enough
basically Leo is know as DH-Series (Demon Heart) an automata created by the world of science(modern earth aka current earth) combined with magic before the current world(in manga) end up typical isekai like now. There only 12 of them 6 already comfirmed before author discontinue the WN being 3 girl 2 man 1 unsure since no description. Leo at initial point being the weakest of 12 since its ability is to growth by copying and gaining imunity to any attack that directed at him. What powered all DH series is what current world call as Philosepher stone so if echidna want the second philosopher stone she need to kill leo and rip his heart