Dawn of the Sun Imps - S1.E13

In a battle, the Spectral Knights and Darkling Lords uncover the tomb of the Sun Imps. Merklynn orders them to bury the tomb, but it is accidentally opened and the Sun Imps are set loose, and soon cause havoc in both New Valerik and Darkstorm. It's now up to the Spectral Knights and Darkling Lords to re-capture the Sun Imps together.