True Power of Asta, Black bulls.
His black five leaf Grimoire
He has five leaf clover Grimoire, until now it's look like demon Grimoire that has lot of power inside it. The sword that asta use, this is the sword of domon or leader of lich and thier members.Anti-Magic sword
He has power to nullify any magic with his anti magic sword. And he can also absorb the power of sword by feeling it's ki.By taking its power Asta ki and power boosted increase massively and it also increase the speed so that he can fight anyone easily. Like he was able to fight against ladros who was crazily strong. And he was able to defeate him.
Demon-dweller sword (shukuma no Tsurugi)
Power of his second Demon-dweller sword that he found in a lock room in secret Castle within a dungeon treasury. This is the ancient demon sword that was sealed thier or store thier in the form scripture.His real parents were not revealed now, it must have some connections with his parents or thier history behind asta having no magic. Like asta and yuno both found together having some connections, we will see it on coming episode.