Domineering Avatar Legplates are an epic-quality equipment item that are only available to Villains and are sold by Requisitions-T2V. Once equipped, they unlock the Avatar Bombardier legs costume style.
Source[]
The Domineering Avatar Legplates are sold by Requisitions-T2V, a vendor found within the Power Core of the Hall of Doom. The item costs $472 and 85x Mark of Conquest.
Vendor item[]
Style unlock[]
Upon equipping the Domineering Avatar Legplates, a character unlocks the Avatar Bombardier legs costume style, which can be accessed at any time from the Style Window.