Deathleaper

Death Leaper is a particularly vicious Lictor introduced during the Canadian Rise of the Swarm campaign in the Third Edition of Warhammer 40,000,. It was originally encountered by a Space Marine named Brother Erasmus. The two fought and both were wounded, Brother Erasmus losing an eye and an arm. As a result of the damage sustained in this battle, Death Leaper's chitinous exoskeleton provides him less protection than most Lictors, but Death Leaper's stealth is unsurpassed, and it is able to conceal itself in places where normal Lictors would be unable to hide.

Notably, whereas Old One Eye and The Red Terror were considered "Tyranid Monstrous Creatures" and could be fielded without the opponent's permission, Death Leaper is unique in that its online stats specifically refer to it as a "special character", and state that an opponent's permission must be sought in order to use it (as is the case with special characters of other races). However, this rule is now invalid, as you do not need permission to use special characters anymore.

A fourth edition "Death Leaper" was also heavily involved in the summer 2006 campaign, Medusa V, introduced as an entirely new species of the Lictor genus, and its reclamation was the central objective for the Tyranid forces involved in the campaign. However, the "aftermath" information states that only one of them survived the planet's fall, escaping in a captured human vessel. This Death Leaper, however; is identical to the Rise of the Swarm Death Leaper in name only, and acts simply as a "special edition" version of the lictor model if the supplemental rules for it are not used.