One of the most dangerous of these flying monsters is the Flying Devourer. This terrifying creature flies at an extremely high speed of around 120 allowing it to reach its target before you can react. Although it only has 150 Hit Points and making it somewhat weak in terms of health and its speed and ability to evade most towers make it extremely difficult to deal with if you're not well prepared.
That's why you should include towers specifically designed to counter this type of enemy in your defense plan and some best towers for dealing with flying Fiends are:
Fountain of Terror which is the tower is very effective against flying Fiends, striking quickly and powerfully, and can effectively halt their advance.
Gloom Owl is also a good tower as it has good range and a good speed and helps destroy down flying fiends before they reach their targets in the battle.
The key is to place this tower wisely in good positions, especially in turns or in areas where fiends often pass more than once. Also, don't forget to keep track of their moves. The more you improve a tower the more its range and strike speed increase, which of course makes a huge difference in defense.
If you want to succeed in Soulkeep, you must always be prepared for any type of enemy, and monsters in particular require advance planning and a focused approach to building defenses.