Dragon Secutorii

On the final day of 815.M41, an encoded data-fragment
contained in a crystalline stasis shell was delivered to
Inquisitor Lord Caidin at the Tricorn Palace on Scintilla.
The Inquisition labelled it “the Euhedral datalith,” and the
data-fragment’s advanced cipher decay required several high-function
cogitators to fully decrypt the partial message within.
Purported to be an urgent communication from an unknown
Tech-Priest on Lathe-Hesh, the data-fragment described an
encounter aboard the Panopticon with a nightmarish force
named “the Dragon Secutorii.”
According to the Euhedral datalith’s unknown author,
the Dragon Secutorii are a force of exactly three hundred
Mechanicus Secutors---all specially selected veteran warriors---sworn to the Lords Dragon upon the annihilatrix altar in the
Panopticon. These warriors are not elite soldiers. Instead,
they are the ultimate sanction of the Lords Dragon, deployed
only as a measure of undeniable last resort. Furthermore,
the Euhedral datalith claims that the Dragon Secutorii have
been involved in a handful of decisive military actions in the
Calixis Sector, notably during the final assault in the War of Brass, as the center of a deep-strike assassination of a Merates
Clan leader in the Meritech Wars, and as part of a boarding
party sent on a secret mission against the renegade fleet of the
Malygrisian Tech-Heresy.
Only a small amount of technical data was recovered
from the Euhedral datalith, but there are hints that the
Dragon Secutorii go into battle encased in massive suits of
specially augmented armor, and bear ancient weapons from
the deepest Lathe vaults. All inquiries from the Inquisition
have been rebuffed, and Lord Caidin considers the file scant
evidence for a formal investigation.