Overall, a pretty good synopsis; details what a Miracle Worker is without explicit examples beyond what they can do.
I might change the wording a bit, personally: "They who perform such marvels are...
known by all as 'Miracle Workers. To one half of the world, esteemed warlords! And to the other, they're naught but demonic heretics.
Yeshu, who has only ever held the latter title, attempts to find himself in this divided world, creating a future for others to come together while severing ties with his past.
He aims to perform... a miracle.
It's key to let reader know what the story will entail, but telling them outright something like killing his mother might be too much of a plot spoiler for the synopsis (I read this as he aims to, rather than he has killed her). I'd save that for early on where he's setting out to accomplish his goals, and mention it there.
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I'll admit, after reading yours I had to go and edit my synopsis to give it more details:
Wolver Squad gets a call to action when a weapon more devastating than anything Gremlins have built before is discovered and about to be turned on Haven. With little information to go on, Blast, Zimthose, Lance, and Balldrick must venture into Gremlin territory to discover what the enemy is plotting, and try to stop them before any harm can be done.
But all signs lead to ruin: Champion knights gone missing, a warning from the sage-like Vise, and a new Gremlin leader more ruthless than anyone can imagine. Blast vows to not let anyone die, but he finds holding onto his ideals in the face of such adversity could be beyond him.