From Warhammer 40k - Lexicanum
The Grav-Rhino was a rare and advanced variant of the Rhino armored personnel carrier equipped with Anti-Gravity drives, allowing it to hover over the earth itself. This vehicle is known to have been used almost exclusively by the Adeptus Custodes and Sisters of Silence during the Horus Heresy. While no Grav-Rhinos are currently known to exist in the 41st Millennium, at least three Grav-Rhinos remained in use with the Sisters of Silence by mid-M32 during the War of the Beast at their sanctuary on Nadiries.
- 1: Horus Heresy (Artbook Series), pg. 326
- 2: Watchers in Death (Novel), Chapter 9