Black Clover's Shadow Palace arc delivered the series' most brutal devil confrontation. Zagred wielded Kotodama magic that bent reality itself. His centuries-long manipulation of human-elf relations finally reached its climactic resolution in this supernatural showdown.
Asta ultimately slayed Zagred with his Anti-Magic sword, though this victory required extensive support from allies. Yami's Dark Magic severed the devil in half, creating the perfect opening for Asta's final strike in Black Clover.
The confrontation against Zagred wasn't a single-hero victory. Multiple factions joined forces in an unprecedented alliance. Humans and elves temporarily set aside their historical animosity to face this greater evil. The Shadow Palace became the battleground where centuries of planning would either succeed or fail catastrophically.

Zagred possessed immense power through his Kotodama magic, allowing him to manifest reality through spoken words and create devastating magical constructs. His ability to regenerate and summon otherworldly creatures in the Black Clover series made him nearly invincible against conventional magical attacks.
Key players in the final battle of the Shadow Palace Arc in Black Clover
Yami Sukehiro emerged as a crucial figure in weakening Zagred's defenses. His Dark Magic proved effective against the devil's protective barriers. Licht and Lemiel Silvamillion Clover combined their arcane abilities to create openings for their allies. Their teamwork threw off Zagred’s timing and stopped him from fully dominating the fight.

Yuno’s expert use of wind magic delivered key assistance throughout the heated battle. His strategic positioning and tactical awareness helped create opportunities for decisive strikes. The youthful Magic Knight showed remarkable progress during this key chapter in the series's story.
While multiple warriors contributed to the battle, Asta delivered the killing blow that destroyed Zagred permanently. His Anti-Magic swords proved to be the perfect counter to the devil's reality-warping abilities. The devil's overconfidence in his regenerative powers became his downfall when faced with magic-negating weapons.
The Black Bulls’ fierce resolve and tireless effort in Black Clover proved essential in achieving the ultimate win. The battle tested every aspect of his training and resolve.
Analysis of combat effectiveness

Zagred's defeat revealed important insights about power scaling in Black Clover. The devil's Word Soul magic and dimensional summoning abilities made him nearly impossible to defeat without Anti-Magic or Arcane Stage magic. This limitation highlighted the unique value of unconventional magical approaches.
The battle emphasized that raw power alone couldn't guarantee victory against strategic cooperation. Multiple mid-tier fighters working together proved more effective than individual powerhouses acting independently.
The question of who defeated Zagred in the series requires accepting the collective nature of his downfall. While Asta struck the final blow with his Anti-Magic sword, the victory belonged to the whole coalition of humans and elves who combined against their common enemy.
In the end, this battle is still a defining moment in Black Clover's narrative set-up. The victory set precedents for future conflicts and highlighted the importance of unity in facing existential challenges.