When I initially started my self-training with blueprints I created a small Project called Frankiestein. It was intended to be a small Open World Zombie Survival, featuring Frankenstein-like Flesh Golems Monsters (that feed off electricity and have an insatiable desire to rip the living to pieces for spare body parts).
I found Creepy Pasta that describes a Virulent Infectious Fungus referred to as The Bloom, as the precursor to the Zombie Apocalypse. I also found The Bloom (a sandbox adventure for Liminal Horror), which also features a fungus referred to the Bloom. The Bloom RPG has a page that describes an golem-like amalgamation referred to The Flesh Hydra.
This coincidence has reinvigorated my desire to work on another Zombie Game combining all of my Zombie Game concepts (like COVID-26) and others (The Last of Us).
Fungus is popular cause nowadays for the Zombie Apocalypse. Obviously my Zombie Fungus would originate from outer space. Glow Green 
Use a Viral Mechanic to grow and replicate electrically charged fungal networks. An Alien Fungus that feeds off electricity and have an insatiable desire to rip the living to pieces for spare body parts.