Be on guard and ready to parry it's strikes. The Lictor is a formidable Tyranid monster that you'll first encounter as a boss during the first campaign mission (following the introduction).

If there’s one constant in the grim darkness of Warhammer 40,000, it’s that everyone ... buffs from Stratagems and/or Characters. The Lictor is a classic assassin unit designed to pick off ...

Warhammer 40k: Space Marine 2 features several models that tabletop enthusiasts will likely recognize. These are some of the best. Several off-shoot strains of the Lictor are specialized killers.