Lethiniums appear as enemies in Smash Run. They attack using powerful energy beams similar to a Horizon Beam, but much smaller.
These petalled pests from Kid Icarus: Uprising are the big guns in the Forces of Nature. If you get close to one in Smash Run, it'll fire a wide beam that even cuts through terrain. However, while firing, it leaves its back totally exposed. Get behind it, and take it out with a special or smash attack.