Lolifex
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A loli carnifex. A joke derived from the tendency of Tyranid players to name their carnifexes by their role and the appellation of "-fex", leading to creatures such as "gunfexes". There isn't really much to this one.
Note: It is very important to remember that Lolifex is a 4th edition Carnifex, and is thus impervious to nearly all weapons and can destroy you in close combat. If you know what I mea-.-*BLAM* Heresy!