He has no magic and has been able to negate any and every magic whatsoever. With the latest chapter, it has been revealed that he was asta’s mother’s adoptive son, thus making him asta’s brother. When asta gets the demon form?
In what chapter in manga he gets the demon form? And in what episode he will get it in the anime (i know its not out yet but how long does it takes what you guys think?) end of chapter 96, full on in 97. It's well into an arc that would likely be in a second season.
The more power he takes, the more demonic his appearance becomes. Asta makes a pact with the demon: His right arm in exchange for more power.
This increase in his power allows him to negate gravitational. Asta 「アスタ asuta」 is an orphan raised under the care of a church in hage after his mother abandons him on the church's doorstep. He joins the clover kingdom's black bull squad of the magic knights and becomes a 1st class senior magic knight and temporarily a royal knight.
When the witch queen uses her blood to heal asta’s arms, which activates his demonic black asta form, she discovers that he is not from the elf tribe, but has a mutation that makes him immune to mana and gives him the ability to. In this chapter, asta is involved in a devil binding ritual. The aim of this ritual was to allow asta to contract with his devil to fully use its power.
By using his powers, asta can transform into a demonic state. Taking all of this into consideration, there might come a day when asta might either lose control, and the devil in the grimoire takes possession of him or takes full control over the devil. Either way, if these come to pass, then chances are, he will turn into a demon.
This grimoire of despair would become useful in. The devil union form is similar to nacht's but he doesn't seem to have such limitations as asta. This form has not been shown in the anime since it was over before the series could cover it.
However, it was shown in chapter 273.