The elemental alchemist, Orokin executioner, serpent whisperer - Lavos!
Passive: Lavos cleanses all active negative Status Effects and gains status immunity for 10 seconds upon collecting an Energy or Universal Orb. Picking up an Energy or Universal Orb has a cooldown of 5 seconds.
Ophidian Bite - Lash out with a toxic serpentine strike, consuming the target to heal Lavos.
Vial Rush - Dash forward, crashing through enemies and leaving an icy trail of broken vials.
Transmutation Probe - Launch a probe that converts Health and Energy Orbs into Universal Orbs that provide both, and ammo pickups into Universal Ammo Pickups. The probe shocks enemies in close proximity. Each electrocuted foe reduces other ability cooldowns by one second.
Catalyze - Catalyst Probes erupt from Lavos and douse combatants in a fiery gel. Damage is doubled for each element afflicting an enemy.
Acquisition: Main and component blueprints are available from Father with Entrati standing.
I think he’s in as good a state as he can really hope for. If you really wanna play Invoker from Dota and throw out lots of elements to get huge damage from Catalyze, there’s now a reason to do that with Impetus! If you just wanna be a big health tank weapons platform, Valence Formation is a really powerful reason to do that. Hopefully his Prime offers a lil more armor or sprint speed, since obv he can’t get any more energy. Not really sure what extra tweaks he’d need.