The trail renderer draws a line based on its change in position. While it was possible to change the trail renderer's length based on velocity (or force), I decided it was better to change the color of the line based on a gradient using the velocity (or force). Originally, I had the trail renderer follow the position of the geometric mean of the swarm. Based on the advice of my teammates, I added the trail renderer to each minion in the swarm.
The Trail Renderer normally
The Trail Renderer when the swarm has enough force
Based on the aethestic value of the swarm emiting a trail as they orbit the orb, we all decided this was the best way to show off the force of the swarm and how it will affect the weakpoint of a boss. This does create some performance issues which will be addressed; however, it is not the bottleneck as the collision between the swarm and an enemy weakpoint is where the biggest performance spike is.