As with the Infector, dismembering any corpses in the room will prevent the Swarm from reanimating them (resulting in them targeting the player), or will result in the production of weaker Necromorphs.This makes the use of weaponry that can make short work of a large area at once an advisable option. The process of infecting a corpse can be carried out by a single Swarm member if given the time.The best course of action is to wait for Swarm creatures to latch on to a nearby corpse, then obliterate it with heavy firepower, destroying the corpse as well as any Swarm members infesting it.On Impossible difficulty, being attacked by a large group of these enemies can quickly prove to be fatal. Be careful about dismembering every corpse in a seemingly Swarm-free room, as when deprived of viable corpses, Swarms will target Isaac and Carver instead.As with all Necromorphs (with the exception of the Hunters), escaping from the Swarm will usually prove futile, as they will quickly find a body and chase after you, if they have not claimed one already. It is recommended to eliminate the Swarm before it is capable of reanimating or infecting a corpse.

If there is one Swarm member, there may be others. Quickly dismember the body before the Swarm gets to it, or destroy them before they can reanimate a body for better breathing room. If the reanimated body is destroyed, the Swarm will rush over to the next available corpse and re-animate a new body until killed.

The Swarm allow for multiple bodies to be infected simultaneously to cause a quick wave of Necromorphs that can overpower the player quickly if not dealt with fast enough. The main attack method of a Swarm is to rush in droves to the nearest corpse and burrow into it, reanimating it and converting the corpse into either a Fodder or a Slasher.

This particular form of Necromorph strongly resembles a scuttling crustacean or arachnid.

Dead space wall necromorph