HGBuild Divers

Saturnix Unit

An armor upgrade kit that turns a support unit into the star of the pose, provided you already own the suit underneath.

MechaGrade Score

3.4/5

Saturnix Unit · 1/144 · 2020

GradeHG

Scale1/144

Released2020

Runnersn/a

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The verdict

I like the Saturnix Unit a lot more than I expected to going in, because it commits fully to being a piece of gear rather than a mobile suit pretending to stand on its own.

It bolts a drill, a claw, and a pair of heel wheels onto Hiroto's Core Gundam II and genuinely changes the silhouette. The catch is right there in the name: this is a unit, not a Gundam, and you need the Core Gundam II already in hand for any of it to matter.

Best for: Build Divers fans who already own Core Gundam II and want the heavy-melee Saturn armor variant without buying a whole new mobile suit

The full review

What it is

The Saturnix Unit is a HGBD:R armor and weapon expansion, not a standalone mobile suit kit. It clips onto the existing Core Gundam II frame through the Planet System and gives it a completely different job: instead of a general-purpose Gundam, you get a heavy, tool-motif brawler built to crush things at close range. The drill forearm and the claw piece are the stars here, they read as genuinely different weapon silhouettes rather than palette-swapped beam sabers, and clipping them onto a suit you already know makes the transformation land. Skill level 2 snap-fit assembly means the parts go together fast, and there is real satisfaction in watching a familiar Gundam turn into a heavy-industrial brawler in under an hour.

The catch

This is the part buyers need to hear before ordering. The kit does not include the Core Gundam II or the Saturnix Weapons set, both sold separately, so the box on its own is an armor shell with nothing to wear it. The wheels bolted onto the heels for ground mobility are held on loosely, and they wreck standing balance, most builders end up leaning the figure forward or reaching for a display stand to keep it from tipping backward. Some markings rely on stickers rather than molded color, standard for the price point but worth knowing going in. It is also a smaller kit by part count than a full mobile suit box, so the value math depends entirely on whether you already have the base suit.

Who it's for

Buy this if you already have Hiroto's Core Gundam II sitting in your closet and want the heavier, drill-and-claw combat variant without a full rebuild, or if you are chasing the complete Saturnix Gundam and are picking up the pieces in order. Skip it if you want a suit that stands proud on its own straight out of the box, this kit is an accessory in the truest sense and it needs a host. For newcomers to Build Divers who just want one representative kit from the line, I would point them at Core Gundam II itself first and treat Saturnix as the sequel purchase.

The build story

What the build is actually like, and the engineering worth knowing about.

Assembly is quick and low-friction, this is a skill level 2 snap-fit kit, so cutting from the runners and cleaning gate marks is the extent of the prep. There is no inner frame to fuss over since you are working with armor shells that clip onto an existing Core Gundam II skeleton, which makes the whole build feel more like accessorizing a figure than constructing a mobile suit from scratch.

The drill forearm and claw unit are the highlight, they combine into a dual-point weapon and genuinely change what the finished figure can do in a pose, shifting it from a generalist Gundam into a heavy melee brawler. The wheeled heels are a clever idea on paper for ground-battle speed, but the loose fit undercuts it in practice, and colors lean on stickers in a few spots rather than molded plastic, which tracks with the price band for an expansion set rather than a full kit.

Lore & trivia

01Saturnix Unit is the sixth Planet System armor for Hiroto Kuga's Core Gundam II in Gundam Build Divers Re:RISE, giving the full assembled form its official designation PFF-X7II/S6 Saturnix Gundam.
02The name is a pun, the katakana pronunciation of Saturnix reads close to Satanics, matching the suit's aggressive, crushing-power design brief.
03The armor was originally built for fights against Gundam Frame opponents but ended up deployed against a Universal Century-type enemy on the planet Eldora, a mismatch from its intended purpose.
04The kit released in Japan in May 2020 as HGBD:R item 024, sold separately from the companion Saturnix Weapons set (item 025).