Arcane Enigma is the second ability for Rose in Plants vs. Zombies: Garden Warfare 2. The ability is similar to the Scientist's Energy Warp, turning it immune to most damage and allows it to travel faster. It can also be used to deal area damage pulses, dealing 20 damage, at the cost of 25% of the energy bar. Arcane Enigma has approximately one second cast time.
Only Rose could make transforming into a being of pure, invulnerable, damage-dealing energy seem so easy.
Arcane Enigma is a good way to protect yourself from incoming damage and destroy your offenders at the same time. However, its duration is rather short, and its damage isn't that amazing.
Arcane Enigma makes Rose invincible, so try to run away from her when she activates it. If Rose is about to unleash energy pulses, use Rocket Leap, Rocket Jump, Warp, or jump as Super Brainz to avoid her energy pulses.