- You said almost indestructible. Does that mean there is a way to kill them?
- There are two.
- Do you want to tell us about it?
- One is by fire. And the complete burning of the body.

17 seconds sound clip from the Immortal Combat (1994) movie soundboard.

You can hear this line at 01:22:54.453 in the DVD version of the movie.

Quote context

[...]

- Drink this. It's bitter, but it will give you strength. It is a drink of my ancestors, made from the root of a plant which grows only on this island.

- Sheila, is that what your ancestors used to turn the warriors into...

- Incredible fighters?

- Yeah.

- Yes, but it must be processed to do that. Drink.

- Mmm! Like a Japanese tea.

- Well, it don't make me feel like ordering sushi, but I could use a shot of whiskey.

- Some of my ancestors perverted the process. They combined it with other things, until they discovered a way of bringing back newly killed warriors from the dead. Stronger and almost indestructible.

- You said almost indestructible. Does that mean there is a way to kill them?

- There are two.

- Do you want to tell us about it?

- One is by fire. And the complete burning of the body.

- I don't think they're gonna sit still for that one. Could you give me another option there, Sheila?

- By removing their heads.

- Terrific.

- They were defeated once before, by the high priest, Hanabku and Shplonke.

- It was prophesied that if this secret was ever again revealed, they would return to save my people and all others threatened by these evil creatures.

[...]