10 Worst Things Loki Has Ever Done To Thor
3. He Initiated The Siege Of Asgard
Remember how the first entry mentioned that Loki sacrificed himself to stop the Sentry? Turns out that was kind of his fault to begin with.
After Norman Osborn helped stop the Skrull invasion, he was made director of SHIELD. He also assembled a Cabal of villains to help him secretly maintain control of the world. Loki was one of the villains who joined.
The God of Mischief had his own agenda though and used his position to manipulate Osborn into attacking Asgard as revenge against Thor. Over the months that Norman was in office, Loki used his manipulative skills to slowly drive him insane and make him easier to control. When the Cabal inevitably fell apart (supervillain egos really don't play well together), Loki finally had the opportunity to push Osborn into attacking Asgard.
The resulting siege threw the Marvel Universe into chaos. Asgard was more or less completely destroyed and many of Thor's fellow Asgardians lost their lives. The Greek god Ares was also killed and all of the Marvel heroes nearly lost their lives when the Sentry snapped and became his evil counterpart the Void.
Loki got what he wanted though, revenge on Asgard and the chance to be resurrected free from his past sins.