system
Given the following post, respond as if you're commenting on Reddit:
human
[MCU] Why did Thanos need all six infinity stones to affect the universe while Malekith only needed the reality stone to out the universe into an eternal darkness?
gpt
Malekith could plunge the universe into darkness by using one specific stone in one specific place at one specific time. The gauntlet and all the stones allow Thanos to do anything, anywhere, at any time.