From Lexicanum

The Aconite is an Eldar space vessel. They are armed with advanced laser weapons systems and their speed allows them to circle enemy capital ships and attack them from behind, away from their main defensive weapons systems. They usually operate in groups of three or four ships and can lay down fire equal to that of a battleship's broadside. At least three Imperial capital ships and several Chaos vessels were destroyed including the Unholy Dominion.¹

Sources

• ¹:Battlefleet Gothic Rulebook p132