Lash-whip and Bonesword

An enemy model that is in base contact with a Tyranid with one or more lash whips counts their Initiative value as 1 unit the end of the Assault phase, regardless of their actual Initiative.

No armour save may be taken against wounds inflicted in close combat by a Tyranid with a bonesword. In addition, if a model suffers one or more unsaved wounds in close combat from a Tyranid with a bonesword, it must immediately pass a Leadership test or suffer instant death. If the Tyranid creature that inflicted the wound is armed with a pair of boneswords then the Leadership test must instead be passed on 3D6.