MY THEORY...... He Himself is a chibi/spirit/demi-god/something... so when the granny said only chibis can enter & and ill see u at the temple..... he can probably walk through the barrier.
So overall... now that the kid is strong af... I wonder how strong compared to adventurers... also.... the contract becomes void root or not .. 1. not abiding by "olivias child being in line".
Bit confused on the stones... the one ains took in the Treasury wasn't that the devil kings? so whats...
NOW all i want to see is his Dragon Breath... However he might have to eat the powder in the neck as well... making sure he eats all corresponding parts to produce flame..