Drop is very similar to Tremor in that it is a powerful overhead swing that causes a long range shockwave. In fact, to perform this attack, you simply perform a Tremor while in the air. You'll come crashing down and do massive damage to any enemies you hit on the way down. Because of the added height, you do more damage than Tremor and because of how far the axe actually travels, it's quite possible to catch several enemies in this attack. After landing, the shockwave moves out towards the distant enemy for more damage.
Much like Tremor, this attack can bounce an enemy into the air at range. This allows you to lead from one aerial attack into the next and to even chain them indefinitely on the higher difficulties. See the expert combo listed at the bottom of the Tremor page but swap out the last Eryx move for an Arbiter Drop. Then link the Drop attack back to Aquila's Aerial Buy In to continue the combo until everything is dead.
