In game it say's 50% bonus XP, but here it say's 100%: https://www.everquest.com/news/eq-feast-of-giving-2021
To be honest, it doesn't actually say it's a bonus. "Starting today and ending on November 29, 2021 at 11:59 p.m. PST, enjoy 100% experience gains and faster rare spawn timers" When you kill a mob, shouldn't you normally get 100% exp from it?
Well that's where you're wrong. In EQ, killing a mob gives IT experience and platinum from your bank. Now, for a limited time, you too can gain some experience.
I remember someone saying that EQ always has a 100% xp bonus, so a total of 200%, so when we get a 50% bonus we get a total of 250%, so it is actually just a 25% increase. Now were did that feather and all those chickens go???
OR..... Or.... Now hear me out. It's going to sound crazy but maybe.... Just maybe the person that wrote it wrote the wrong number and then edited it to say the right number later. P.S. Your link says 50 percent gains now.