One of the spells I personally love to use is Damage Amplifier. This spell simply multiplies the damage you deal to fiends . This means that if you have a unit or tower that deals a good amount of damage, after you activate the Damage Amplifier that damage increases well for a certain period of time.
Let's talk numbers as this spell can be used five times so it's not just random. You need to know when to use it well and it has a Spell Radius of 100 meaning it has a good range of effects on enemies in the area.
It works for 15 seconds, but the important thing is that the Amplifier Duration, which increases damage lasts for 5 seconds. During this time, the damage is multiplied by 1.5x, which is a good number especially if your attack area is already strong.
The great advantage of this spell is that it not only helps you quickly clear a wave of Fiends, but it also helps you conserve resources. Instead of throwing all your weapons and losing them to powerful monsters, you can activate this spell at the right time, allowing the same weapon or tower to finish them off more efficiently.
