From Lexicanum

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Hive lords are a Tyranid unit mentioned in Warhammer 40,000: Rogue Trader.Hive Tyrants are described here as ruler and primogenitor of the whole Hive Fleet, immensely psychic, huge, bloated with eggs and virtually immobile. Similar to descriptions of the Norn-Queen of more recent publications. Therefore day-to-day affairs of the hive were conducted by a sub-strata of Hive lords. Hive lords functioned as army and unit leaders, ship commanders etc.¹

Sources

• ¹:Warhammer 40,000: Rogue Trader