If we're bringing in Elder Scrolls deadric artefacts... I demand we implement the Wabbajack from Oblivion!
A weapon which turns ships into any other random ship!
Imagine it, you load the heavy weapon and shoot the Squid and *Poof!* the squid turns into a Mobula!
Or if not restricted to Deadric Artefacts...
The Shivering Isles: Dagger of Friendship!!
Stab the guy and the magical enchantment heals his wound.
One shot armour break heavy weapon, which also repairs the armour at the speed of two spanners!
*laughs manically*
I'm so happy I could tear out your eyes!
*Composes himself and resumes his professional manner.
Guns of Icarus medi-gun would have to work like mine launcher, launch a mine and when it explodes, it deals knockback but also repairs broken components, and like mines, will not discriminate friend from foe.