- Cleansing of Garial-Fall (Unknown Date) - The Tarantulas Chapter, along with the 15th, 70th and 93rd Karadmium Regiments of the Astra Militarum and Battlefleet Ultima Secundus, answered the call of Inquisitor Ebrehem Arkannis, who was secretly a member of the Radical Istvaanian organisation called the Elucidium, to purge Garial-Fall, a poorly defended and administered Imperial planet. Garial-Fall harboured both a Genestealer Cult and Ariale, an Inquisitor of the Ordo Xenos who had infiltrated the cult under the guise of a Magus, and was an enemy of the Elucidium.
- Exterminatus of Torakal IV (Unknown Date) - The Tarantulas Chapter carried out an Exterminatus on the Exodite colony of Torakal IV.
The Tarantulas' Chapter colours are not listed in current Imperial records.
The Tarantulas' Chapter badge is not listed in current Imperial records.
- What Price Victory? (Anthology) edited by Christian Dunn and Marc Gascoigne, "Elucidium" (Short Story) by Simon Spurrier
- Xenology (Background Book) by Simon Spurrier, pg. 84