Naga royal guard, as their name implies, serve as protection for important individuals.
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They are believed to be a magically-enhanced strain of Myrmidon. It helped both Illidan and Vashj in their efforts.
Even though the Naga society is female dominated with mainly females studying magic, these creatures are by far the strongest units in the naga army possessing both immense physical and magical power. In the game (Warcraft III), they were so powerful that players considered them on an equal footing with Hero units.
Naga Royal Guard's Abilities
Frost Bolt (ranged stun and damage)
Crushing Wave (line damage)
Resistant Skin (reduces effect of negative spells on this unit)