Scrolls

Scrolls are very similar to spells. However, using scrolls in battle will cost Gems. Also, scrolls will level themselves up automatically with your king level; and, unlike spells and units, you can only equip up to two scrolls. When your scrolls level up, their cost increases will increase too.

Scrolls, unlike spells, do not fall into categories of damage and defense. Instead, they have a
diverse range of effects; such as instant unit reinforcements, slowing down the 2 minute and 44 second timer you get for raiding someone’s base, or some really big explosions.

Scrolls (assuming they do not have instant durations) have a longer duration depending on what level they are. The exceptions to this are Apocalypse
and Armageddon, which each last only for one second.

A scroll’s cooldown also gets shorter the higher level it is. This, besides costing gems to use them, is the only one characteristic that distinguishes scrolls from spells. The
scroll with the shortest cooldown is Battlecry; the scroll with the
longest is Armageddon.

When the hero is resurrected, all scrolls are recharged at once, just like spells.

Scrolls either are stationary, meaning they do not travel with your
king; but instead are plumped down wherever your king was standing at
the time, or they have so big a range that it doesn't really matter. The
exception to this is Battlecry; if you use it, you may want to utilize
the hero scream to attract more units, making the scroll more effective.

There are several ranges for scrolls. Blessing has the shortest
range, whereas others, like Apocalypse and Armageddon, have a range of
nearly 10; and Battlecry has a range of 5.5. And others, like Summon, do
not exactly have a range...