|Crystal Defenders Enemy|
|Wave Number||Wave 20|
|HP||5,000 (Bisga Greenlands)|
3,750 (Bisga Greenlands Adv)
2,750 (Orchise Snowfields)
2,250 (Orchise Snowfields Adv)
|Abilities||Steals Multiple Crystals|
The Vrtra is an enemy from Crystal Defenders. The second major enemy encountered, the Nagaraja only comes in a wave of four, but their very high HP for this point of the game means a team might be unable to defeat a single one resulting in a loss of eight crystals due to their ability to steal two crystals instead of one.
A large number of troops are needed in order to dispatch these resilient enemies, however, players can instead max out the level of some of their units.