Board Thread:News and Announcements/@comment-25737724-20160517141710/@comment-25737724-20160518042115

There's no benefit to applying 5 at once as opposed to 1 at once in terms of success for each book. Each should have a 10-12.5% chance of skill up. 2x events should double those odds.

Slight discount in Beli is the cost is always calculated by current level. So if you increase your level it increases cost