This is the 16863rd most frequent Korean word.
살해할
"살해할" means "to kill" or "that will kill."
In this sentence, '살해할' modifies '방법', indicating methods to carry out killing.
그들은 상황이 악화되자 살해할 방법을 논의했다.
They discussed ways to kill when the situation worsened.
Here, '살해할' forms the future tense of the verb '살해하다' indicating an action that will happen.
그 여신에게 반항하면 그녀가 살해할 것이다.
If you rebel against the goddess, she will kill you.
The word '살해할' is in a form derived from the verb 살해하다 meaning 'to kill', used here as a modifier to describe intention.