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{{TyranidsPortal}}
[[Image:Grendyllus.jpg|thumb|right|250px|[[Imperial Guard]] battle the forces of Grendyllus{{Fn|1a}}]]
'''Hive Fleet Grendyllus''' is a newly discovered colossal tendril of [[Hive Fleet Leviathan]], that invaded [[Segmentum Pacificus]] alongside [[Nautilon]] and [[Promethor]], which caused the [[Fourth Tyrannic War]] to begin.{{Fn|1a}}
==History==