Event books - Salvation is this an error in drop file ?

[Gritt]

Hi , just an observation , myself, friends and guild m8s are little bewildered as to why this is in the GG - Brain cave as a book drop , just wondered if it should have been another book in its place as most books are dropping of the new ones yet this pops up alot ..... and its low level skill thats learnt already by almost 99.9 % of all taos over 110.
Otherwise fun event even if mobs in the large caves hit like trucks .....

 

[Rezkin]

yeah very powerful can only go a few mins but still manage to get some flesh, deff ideal to be in a group hunting and just alternate picking up the flesh pieces. heard the GG/private cave is easier.

 

[Scorpian]

It's definitely not replacing something by accident. Just wanted to make sure there were enough of the new books floating around in game