Slow Aura is a card that reduces how fast enemies move whenever they are within your tower's range. The reduction is applied as a percentage, so faster enemies lose more raw speed than slower ones.
Description
While an enemy is inside your tower's range, Slow Aura lowers its movement speed by a percentage of its current value. Because the effect is percentage-based rather than a flat amount, it scales with whatever speed the enemy has at the time.
Use
Slow Aura stacks multiplicatively with other speed-reducing effects, specifically the Chrono Field ultimate weapon and the -40% enemy speed / x2.5 enemy damage perk. Since each effect multiplies the enemy's remaining speed rather than subtracting from it, their combined slow can never push an enemy's speed all the way to zero. This makes Slow Aura a reliable pairing with those effects when you want heavy speed reduction without worrying about wasted overlap.