Is there any way to spawn monsters in the air and make them fall down ?

Side note: I would love to drop barrels from above and make them detonate from falling damage.

When the monsters spawn in, they spend a short time invisible and uninteractive. This is to give clustered groups time to organise themselves (e.g. a large group of tinymon). I should have suspended their height position, but they also fall during this phase. So with the current version, you can spawn them in the air but you need to place them higher up to account for this.