What might at first appear to be a hazily-defined bipedal creature, the Issuv is in fact a colony of small insect-like creatures that work together as a single, larger body. The colony can reshape at will because it is made of a conglomeration of smaller beings working as a unit, which also makes it harder to hit (due to their ability to scatter and reform). In addition, this imparts the ability to get into small, tight, or difficult-to-access spaces. It is not uncommon for an issuv to wait in a crevice for prey to pass, and then come pouring out to attack.

An issuv has the ability, if it is sufficiently large, to envelop an enemy. They will then attempt to suffocate an enemy, who must save vs. Death Ray to break out of the covering mass. If not successful after three attempts, the issuv will suffocate its enemy. Any prey who is enveloped will be victim to any attacks levied towards an issuv.

While an issuv can conceivably separate at will into smaller entities, it will rarely do so because of the acquired social bond between the actual organisms making up the large whole.