A Deacon is a type of Xenomorph relative that may be an ancestor to the Xenomorph.
The Engineer Deacon is 3 feet tall at birth and ranges in color from blue to black. They have a sharp beak-like dome and have five fingered hands. They lack the dorsal tubes and tail of a Xenomorph and possess a different inner jaw.
A Deacon is impregnated by a Trilobite into the host's abdominal cavity. They use their domes to cut through the host's abdominal cavity. They then break out of their embryonic sack