To reduce the cost of accidentally clicking on the scroll during battle. Could someone provide the list of gem costs for the scrolls? I find the information given in game abysmal for RR2 compared to other games (which are more transparent in their numbers)
You can find that info on Wiki:
The gem costs for scrolls varies according to Hero level
That’s why I told my youngest not to equip the second scroll. That way odds are reduced to accidentally click a scroll.