[What about 3 client limit?]

Don't expect return of this limit. They're removing it for the live servers as well with today's maintenance.

[Classic Server Unscheduled Maintenance: Friday, May 17, 2019]

1 hour ago, Kakka said:

After yesterday's patch, you can directly do 2nd class transfer by 1 click and the spellbook chest and 10 100,000 sp scroll will appear in your inventory.

Looks like people that did class transfer before patch are screwed. Are the contents of this chest random and can you share these SP scrolls within an account (dimmensional manager)?