"In our arrogance we thought it would be there forever, our path to the heavens, to enlightenment, always within reach whenever it was desired. Instead we turned our eyes and souls to the Earth in any and every way to exploit it for our own desires. It was Astrid who could take our hubris no longer, climbing into Yggdrasil's branches, then reaching down the trunk and severing it cleanly with the most silent whisper. Rising to the sky in Yggdrasil, she took our best potential with her to the heavens and left us to the Earth precisely what we had lusted after so cravenly. 'Suffer in your righteousness now, children of Earth. You have sealed your own destruction' said Astrid at last." Source: some BS I just made up.