Talk:Overlord Volume 06/@comment-125.212.121.135-20150820152136/@comment-26501532-20150902203131

It may be due to the effects of world items but it also be the lost of her experience through her memories. As it is shown that NPCs can learn things mentally even though their basic stats and abilities are fixed.

It can be as Shalltear said that she was "borned" this way, so she would get "reborn" this way too, losing some memories on the way, causing her to be back to her original state.