Q&A: Hive Fleet Kraken

Q: There has been some concern about the abilities of Tyranid bio-titans, given that they have no shields or special saving throw. Part of the background information says that the Tyranid titans have regeneration. Is this:

1. Some special, otherwise undocumented feature;
2. A reference to the ability of all war engines to repair damaged systems.

A: The ability of Tyranid Bio-Titans to regenerate is represented by their high armour value and number of wounds.