Assertion: tentacle | /r/HasProperty | seen throughout the series
Facets:
value: on xen
type: LOCATION
Source sentences:
text: It is first seen in a rocket propulsion test chamber in Half-Life, but is also seen throughout the series on Xen, in other areas of the Black Mesa Research Facility in both Half-Life and Opposing Force, and in the Quarantine Zone in Half-Life: