Editing Temple of the Abiding Truth

{{Status|Canon}}

The structure is located on an island in the middle of the urban city-state of Ontom, and is surrounded by a large walled courtyard. Although not particularly large on the outside, the structure contains a labyrinthine tunnel network running for many kilometers underneath the island.<ref>'''Halo: The Thursday War''', ''page 117''</ref> Some of these passages have been closed off by the Sangheili, who have also added certain features to the original construction, such as additional lights.<ref name="ttw84">'''Halo: The Thursday War''', ''page 84''</ref> However, further down in the tunnels, the passages are alight via original Forerunner lighting systems which lack visible light fixtures of any kind.<ref name="ttw160">'''Halo: The Thursday War''', ''page 160''</ref> Additionally, the interiors further down the complex are completely clean and pristine, despite over 100,000 years of abandonment.<ref>'''Halo: The Thursday War''', ''page 122''</ref>

Largely constructed of stone, the walls within the temple are perfectly smooth and the seams in the stonework are barely visible.{{Ref/Reuse|ttw84}} The stonework exhibits a curious, malleable quality; the walls are capable of reconfiguring themselves to some extent.<ref name="ttw159">'''Halo: The Thursday War''', ''page 159''</ref> Invisible energy fields cover some of the walls,<ref>'''Halo: The Thursday War''', ''page 85''</ref> which makes the solid stone walls feel unnaturally soft,{{Ref/Reuse|ttw159}} even "furry".<ref name="ttw164">'''Halo: The Thursday War''', ''page 164-165''</ref> Many of the walls are covered in crisply carved [[Forerunner symbols]] in cartouche-like arrangements.<ref>'''Halo: The Thursday War''', ''page 118''</ref> An instruction not to release the [[Didact]] without the permission of an unspecified individual, apparently of a superior rank, is repeatedly displayed among the symbols.<ref>'''Halo: The Thursday War''', ''page 163-164''</ref> In addition, the symbols have references to the Halo installations and their possible locations.<ref>'''Halo: The Thursday War''', ''page 157-158''</ref> One of the symbols was similar to a glyph found in the [[Onyx]] [[Dyson sphere]], [[Trevelyan|Shield World 006]], roughly translated as "storehouse", "garage" or "[[sarcophagus]]".<ref>'''Halo: The Thursday War''', ''page 176''</ref> Despite being apparently carved out of stone, the symbols are also capable of shifting and assuming different shapes.<ref>'''Halo: The Thursday War''', ''page 158''</ref> This feature may be facilitated through the use of [[hard light]], a technology used by the Forerunners to create realistic surfaces mimicking various forms of corporeal matter.

The entrance to the complex contains a field which mutes all sound coming from the outside;<ref>'''Halo: Glasslands''', ''page 137''</ref> similar [[Acoustic dampening field|auditory dampening technology]] is also present inside the temple, where the passages do not echo as they would based on normal acoustics; the air inside the temple was described as being abnormally thick and muffled.<ref>'''Halo: The Thursday War''', ''page 104''</ref> This causes an unnerving, buzzing sensation to people inside the structure.{{Ref/Reuse|ttw160}} Like certain other Forerunner facilities, the structure interferes with human communications equipment, with communications to the outside breaking up some hundred meters into the tunnels.<ref>'''Halo: The Thursday War''', ''page 172''</ref>

A chamber deep within the structure houses a [[teleporter|translocation portal]] which links to another structure in [[State of Acroli|Acroli]] approximately 80 kilometers away. By the modern times, the structure in the receiving end has fallen into disrepair, although the portal remains functional. The activation system for this portal, generated on the spot from the wall panel upon touching the right symbol, greatly resembles a Sangheili [[arum]], being comprised of multiple concentric spheres that must be aligned to release a small object within.{{Ref/Reuse|ttw164}} Such locks may have served as the original inspiration for arums.

Constructed by the Forerunners over 100,000 years ago, the structure is one of many Forerunner creations on Sanghelios that the planet's Sangheili inhabitants have come to revere as sacred, eventually building the city of Ontom around it. At some point, the religious order known as the [[Servants of the Abiding Truth]] made the complex their main base of operations, a function it also filled during the Abiding Truth's resurgence following the end of the [[Human-Covenant War]] and the outbreak of the [[Blooding Years]]. The Abiding Truth, now a militant cult under the leadership of [[Avu Med 'Telcam]], coordinated their operations and stored large amounts of their arms and equipment in the structure.<ref>'''Halo: Glasslands''', ''pages 138-139''</ref>

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