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The Mother Virus is a Boss, which always spawns in Virus Clusters. (In Virus Hyperclusters and Virus Ultraclusters, two Mother Viruses will spawn. [The ones in the Hypercluster are stronger than those in the Ultraclusters.])
Swarm: It will spawn 6 stronger Virus Guards from its 6 sides two times.
Spike: It will chase a player, spike first, and if the player touches the tip of the spike, it will lose some Health.