Gatherer Sentinel

"Gatherers" are Forerunner machines whose primary function is to gather species and to catalog them. So far, these machines have only been observed operating from Line Installation 1-4 on an Unnamed Moon.

Description
Gatherers consist of a fairly large main body with three red eyes, with a holding tank for captured specimens on their backs, filled with a purple liquid. They have eight tentacle-like clawed arms, as well as two much smaller arms. They have four legs, although they have been seen floating through the air.