Hogwarts and the Legacy of the Holy Grail War

Ethan, a transmigrator who was exceptionally admitted into Hogwarts School of Witchcraft and Wizardry, discovers that his magical talent is far above average. In fact, it's absurdly high. On top of that, he can use legendary ancient magic.

So begins his troublemaking career in the magical world.

What's this? A corrupted, black-mud-tainted Holy Grail? Slash it.

What's this? A noseless, bald Dark Wizard? Cut him down.

What's this? A ghostly boss from the last century? Send it to the afterlife.

What's this? An ancient hidden treasure beneath the school? It's mine now.

After a relatively easy fight, Ethan looks at the enemies collapsed in front of him and sneers:

"I didn't even use full strength, and you're already down."

Later on, having retired early and enjoying a relaxed life at home, former Auror chief Ethan shares his battle philosophy with a reporter:

"Light spells for blinding, disarming to remove weapons, stunning for knockouts—such a perfect combo!"

The reporter asks:

"What if that combo doesn’t work?"

Ethan smiles calmly and replies:

"Easy. Just use Avada Kedavra."

Note: This book includes significant alternate lore, out-of-character portrayals, and a modified timeline. Read with anticipation.