Everquest was a game where you saw things that were impressive: EK Chasm and Carvings, the NK bridges, Erudin, old statues coming out of the ground... but the lore doesn't exist. It was never anything but a thin veneer for the most hardcore of roleplaying types.
Classic EQ: The gods took turns creating races, and eventually everyone fought a war against the races of Rallos Zek. The non-Rallos winners formed the Combine Empire, and it was glorious. The Combine Empire (generic as hell name) used to exist, and now it doesn't. Small cities and villages have grown in its wake. Those impressive sights I mentioned before? Nadda... just Combine relics... we guess. Hell, most of the story isnt in the GAME, it's in the manual or the opening video that didn't play for 95% of people.
Kunark: The Iksar Empire used to exist... and now it doesn't. Some scattered villages have sprung up in its wake, and the factions are building bases.
Velious: Be friends with a dragon; fight a three way war. Not sure Velious had lore beyond the marketing taglines.
Luclin: Turns out the Combine Empire wasn't glorious! Did you a bamboozle! Check out the bizarre moonpeople societies that have sprung up in its wake...