The components are:
The "terror" effect is essentially the same as Fear, but the movement speed of affected targets is increased by 25%. This can make the drums very useful for gaining distance.
BackgroundThis section concerns content exclusive to the Warcraft RPG, and thus unlikely to be canon.
These kettle drums are orc creations, played from the mighty shoulders of the kodo beast. They are always created in pairs, and are sometimes made of leather cured from high elf skin; the warlocks who make the drums claim the elves' addiction to magic makes their skins highly magically malleable. Other races use animal leather and see no difference in power.