Hey ECR, welcome back - more fanfic, please...I can't fill out an OOB I don't know about
Name is undetermined, taking suggestions if you have them. Current short list is Castigator, Invictus, and Eversor (fairly unoriginal, I know). Wonder if Umbrator is actually a valid Latin word (shadowmaker/caster?). Damn Saxton for taking Mandator - such a perfect star dreadnought name...
The Eclipse, in my interpretation, is a ship that was built simply as a cart for the prime weapon system it was meant to mount. The power of that miniature superlaser is in doubt, of course, but it doesn't seem like it's calibrated to take on other ships or snipe non-planetary scale targets. With the space needed for capacitors, cooling systems, and bracing for a real axial mount like that (multi-kilometer and looking like it's integral to the hull), it wouldn't surprise me if the rest of the normal warship systems were starved of power, design attention, or priority in placement to accommodate it. For one thing, if the New Essential Guide rendering of the Eclipse is correct, the thing probably accelerates like a ore hauler. Tiny nozzle area, and precious few of them to move a ship that large. No large visible turrets, so can't make a judgment there, but probably not as good as it could be, especially with a big beard housing (probably) more superlaser components splitting the forward ventral arcs.
Also possible the project just had low priority compared to Death Star II, or that miniaturizing the superlaser took longer than expected, or integration caused major unforseen problems with the original hull.
Updates:
(first one is 5280 width, second one is more reasonable at 3840):