Way back in 2005 Tim Huckleberry put together an unofficial Codex: AM. While squarely aimed at the tabletop and IG style armies, it does have two lovely nuggets that could be used in a game of Deathwatch. From Codex: AM I present you the Plamsa Blaster and Mechanicus Staff of Office.
Name: Plasma Blaster
Class: Basic
Range: 100m
RoF: S/2/-
Dam: 1d10+9E
Pen: 8
Clip: 40
Rld: 4 Full
Special: Storm, Volatile
Wt.: 40 kg.
Req: 25
Renown: Famed
The Plasma Blaster is a specially built combi-weapon crafted in the 38th Millennium. It incorporates two plasma guns on a weapon mount suitable for replacing the Storm Bolter on a suit of Terminator Armor.
Name: Mechanicus Staff of Office
Class: Melee
Dam: 2d10+2E
Pen: 8
Special: Concussive, Power Field
Wt.: 10 kg.
Req: 35
Renown: Famed
Only the most senior Tech-Priests are gifted with one of these very powerful and rare tech-relics. Glowing with circuit-runes, the Staff contains nano-sized warp portals which burst open on contact. The impacts on the portals create intense localized warp disruptions, causing micro-explosions which devastate the struck enemy. A Mechanicus Staff of Office require two-hands to wield properly. Only Techmarines are trusted with this weapon among the Astartes. A Mechanicus Staff of Office is a Master-craftsmanship weapon and its stats have been modified to reflect this
Comments are welcome