Warning! Spoilers head for Black Clover chapter 331!
Lucius Zogratis' unexpected murder of Damnatio in Black Clover has the potential of actually being the worst thing that could've happened for Asta in regard to his prospective acquittal and execution.
Chairman Damnatio Kiro of the Clover Kingdom's Magic Parliament was originally the main driving force who behind Asta's execution, as he designed the trial in such a way that the prospect of a conviction was likely. But the fact that Asta recently saved Damnatio's life during the devils' initial invasion of their world in chapter 319 of Black Clover undoubtedly contributed to the possibility of the chairman acquitting Asta of charges. Way back in chapter 217, Damnatio lured Asta to the Magic Parliament Courthouse under false pretenses, ostensibly just asking for eye-witness accounts of the Great War that had just transpired. But the chairman soon made it evidently clear that he planned on either convicting Asta for being a devil or the Black Bulls for recruiting and harboring one. However, later on in chapter 282, Asta performs a devil union with Liebe right in front of Damnatio to protect him and the entire Clover Kingdom from a rampaging demon unleashed by invading devils.
Related: Black Clover's Disappointing Asta Reveal Actually Makes Sense
Because of Asta's ability to maintain control when fused with a devil while protecting Damnatio himself and the entire Clover Kingdom, Damnatio most likely changed his mind about convicting Asta. But now that Lucius Zogratis just killed Damnatio at the end of chapter 331, some other parliament figure who either did not witness or wasn't directly affected by Asta's heroism will likely take over and not feel compelled to exonerate
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