The Breach and Clear tool for the space frontier, is brutal, probably a waste of useful resources, but definitely makes you look tacticool and sci-fi in space :D
The H2 Last Sunset is a direct energy weapon, that fills the archetype of the super shotgun combined with the dragon's breath. It uses hydrogen as fuel to shoot plasma, causing very high heat and electromagnetic damage with a short-range, you can also use its hydrogen cartridge as a plasma grenade to deliver massive damage in a 6m radius.