In Royal Revolt 2 is possible to use magic powers to destroy enemies bases. These magic powers are divided in two categories:
Spells are the most used magic powers since they don't required gems to be casted but only the tap/click on the spell if you want to cast them. More levels a spell has more damage/defence/health it will do/give.
Scrolls instead are magic powers much better than spells which allow you to do more damage, gain more health, defence, slow the time, etc and are essential when you are in dangerous cases and this is why they require gems to be casted.