Tyrant Guard
From Lexicanum
The Tyrant Guard (species name: Tyranicus scutatus) are a special species of Tyranid spawned in small broods for the sole purpose of defending the Hive Tyrant from focused fire.
Over the centuries, the enemies of the Tyranids have learned to target the synapse creatures of their swarms, denying them the critical influence of the hive mind in battle.
The Tyrant Guard are large, tough, difficult to harm, and it is nearly impossible to surpass their defences when they are active in their purpose as bodyguards. They are completely blind, utterly controlled by the synapse creatures they protect.2 On occasion, a Carnifex may also benefit from the Tyrant Guard's protection.1 Tyrant Guard are scientifically rumoured to contain the DNA of defeated Space Marine chapters (their bodies appear to include a fused ribcage and a Black Carapace), but the Imperium considers this blasphemy and denies its possibility.1,2
