Back when I was a custodian, the coolest things I thought we had were the big floor scrubbers or the portable, electric power washers. Space Marine Custodians get a lot cooler gear. One such piece is the Contemptor-Achilles Dreadnaught, available for pre-order from Forge World now.
From the website:
In those isolated cases where the body has been all but irrevocably destroyed but the Custodian’s mind remains intact and their will to survive undimmed, internment within the cold and unyielding body of a Dreadnought is the next step. To this purpose, the few Dreadnoughts of the Legio Custodes are as singularly advanced as their other wargear, outfitted with weapons and systems artificer-made by the servants of the Imperial Court. At the time of the outbreak of the Horus Heresy, the most widely employed was the Contemptor-Achillus, a general battle unit which combined phenomenal strength and speed with the echoes of the interned Custodes’ own unmatched martial skill.