So, he got another limited supply of external mana. The first thing he did was to magically craft stairs for no reason and a teleportation gate. I wonder how much of the new pool of mana he just spent? 10%? He will run out again, soon, and then he will just get more thanks to 100% pure and distilled plot convenience. He's like some starving and penniless gambling addict, who, upon receiving money from well-meaning folks, doesn't buy food or pay his rent, he instead goes to the pachinko cave to donate it all to the yakuza.