system
Given the following post, respond as if you're commenting on Reddit:
human
[LOTR] How bad would things have to get on middle earth before ol’ Eru himself got involved?
gpt
The only time he's done so in the past was the Numenor debacle (basically Atlantis. Tolkien hated thinking of it as Atlantis but it's obviously Atlantis). 

The king of Numenor, Ar-Pharazon, had managed to capture Sauron himself, and was feeling pretty good about himself, but OF COURSE Sauron just used the opportunity to whisper poison honey in the king's ears, and told him he and his followers could be immortal if they invaded Valinor (the home of the gods). Pretty soon Numenor, which used to be a nice place, was full of little cults popping up to Sauron, and Ar-Pharazon decided to go ahead and invade Valinor. 

Long story short, the Valar (gods) felt a little unsure of what to do so they phoned Eru (big God). Eru utterly wrecked the invaders' shit, and affected the world so hard that Numenor got totally wiped out. To make sure no humans ever tried that again he changed the shape of the Earth, and now Valinor isn't in the west anymore, but some other dimension or something (not the words the author used, but good enough)