Hmmmm, right now on Elbaf we have 5 person, who can tell a lot of lore to Mugiwaras:
1. Zeus - who can tell about God Valley and Rocks
2. Gunko - who can tell a lot of interesting things about Imu
3. Ragnir - who can tell about Nika and ancient times
4. Big Owl - who can tell a lot of lore in the librarry
5. Gaban - who can tell a lot of thing about Roger's team
I cant wait for all of this information in the end of arc