Kidou Senshi Gundam 00 S2, the Seraphim Gundam suit was installed on the Seravee Gundam as a back up unit for its weaponry system. However, one must remember it is also a unit as itself, bestowing the title of "gundam" on the Seraphim. Piloted as well by Innovado, Tieria Erde, it gives him the rights to have 2 MS~!
Nadleeh Gundam, was the first of it's kind to test it's fighting capabilities. For a back up unit, it does pretty well in combat terms. The Nadleeh was hidden in the Virtue Gundam, making it different from the Seraphim in certain aspects. Will talk about that soon.
Unit DesignDIDN'T notice it at all at first. First appearing on Epi 1, as a face on the back of Seravee, it was only introduced later as a unit during the battle with Innovador, Bring. Shocking us (and innovados), it had a resemblence to the Nadleeh concept.
full black instead of the predecessor, full white hull.
Because it is relatively small MS, compared to the others in 00, it does not carry many armaments on board.
Unfortunately, it didn't import any defence mechanisms from the Seravee, making it a sitting duck once shot. but, it does have other systems installed as it was a back up unit after all.
Because Seraphim is able to produce GN particle at the arm unit, if enough particles of a higher density and concentration is applied to the shield, it can penetrated the GN Field.