The phrase "after slaying" is correct and usable in written English.
It can be used in contexts where you are describing events that occur following the act of slaying, often in a narrative or storytelling format.
Example: "After slaying the dragon, the knight returned to the village as a hero."
Alternatives: "following the kill" or "subsequent to the slaying".
After slaying most of the Indians, the Spanish imported slaves from their African colonies.
According to all the ancient sources, Gyges came to the throne after slaying King Candaules and marrying his queen, but there are several versions of the event itself.
The physician, after slaying a trio of infamous murderers, sets about helping freed slave Django (Jamie Foxx) liberate his enslaved wife (Kerry Washington) from Leonardo DiCaprio's sadistic plantation owner.
One morning, I met Rohmer in New York, in Baumbach's bright, never-ending apartment: he was wearing gold battle armor and was knighted by Gerwig after slaying his father, the dragon.
He also has two hearts and an impenetrable skin, which he picked up after slaying a particularly hideous dragon who liked taking mudbaths in what is left of the ponds on Hampstead Heath.
An ambitious Fyodor Dostoevsky-like meditation on the nature of evil and culpability, it centred on Martin Landau's portrayal of an ophthalmologist who wrestles with guilt after slaying his mistress (Anjelica Huston) to prevent her from revealing their affair to his wife (Claire Bloom).
After finally slaying the Hydra, he cut open the body and dipped his arrows in its poisonous venom.
Ammon is initially unwilling to help the player character, but after inadvertently slaying his descendant Shandra, he repents and joins the party.
Gunfire exchanges in the Gaza Strip intensified after Mr. Ayyad's slaying.
Soon after Faulkner's slaying at about 1 a.m.
Detectives were back in the neighborhood Thursday, Wiener said, this time canvassing after Gatto's slaying.
