What if the Quantum Entanglement Device returned as a Field Upgrade?
We could see things like:
\- Any existing Field Upgrade
\- Grenade Drop/Dud Grenade Drop
\- Demented Echo Spawn
\- Friendly Plague/Hell Hound
\- Gersh Device Effect
\- The occasional Power-Up
Its tier upgrades could relate to good-bad outcome ratios, how many charges, and output of good outcomes (more ammo/armor/equipment and so forth).
It could be balanced to negatively affect the wielder more than other players.