system
Given the following post, respond as if you're commenting on Reddit:
human
[MCU] If Asgardians are "basically immortal", then how was (SPOILER) killed by a single dagger stab?

The dark elf guy kills Thor's mother with a single stab. Yet it seems like Thor could survive an RPG blast to the head. Is there something unique about his physiology compared to his mother's?
gpt
The person wielding the knife is extraordinarily strong. There's also no way of knowing exactly what said knife was made of.

Asgardians and denizens of the other realm seem perfectly capable of killing each other with all kinds of weaponry, and were doing so at the beginning of the story, so it doesn't seem extraordinary to me that Frigga could die in the same manner.