Dreadnought H is a modified version of the YMF-X000A Dreadnought Gundam that incorporated elements of Canard Pars' CAT1-X1/3 Hyperion Gundam Unit 1. The original Dreadnought's DRAGOON system is removed as Canard cannot use it, and the only weaponry retained are the four head-mounted MMI-GAU2 "Picus" 76mm CIWS. The new backpack parts in place of the DRAGOON system is known as the 'Eta Unit', and this is the reason for the suit's new name (the "H" is Greek alphabet "Eta", and it also refers to the backpack's shape). The 'Eta Unit' has pairs of "Igelstellung II" CIWS, grenade launchers and beam cannons which can also function as large beam sabers.

Depending on the configuration of the weapons on the backpack, Dreadnought H can assume a long range attack form, the Buster mode, or a close combat form, Sword mode. For defense, the Dreadnought H has two "Armure Lumiere Handy" monophase lightwave shield, a modified version of the monophase lightwave shield used by the Hyperion. Another weapon retained from the Hyperion is the RFW-99 "Zastava Stigmate" beam submachine gun with a mounted RBW Type 7001 "Romteknica" beam knife on it.