The Bionic Fuel is a Bunny-exclusive Module that you will be able to get your hands on in The First Descendant. It’s a core part of some of the most overpowered Bunny builds in the shooter as it will let you maximize her Speed of Light ability.
When you have this Skill Module equipped on Bunny, you can decrease the speed of Speed of Light. This will let you have more control over her when you are looking to charge up her Electricity gauge.
However, the shooter is not entirely clear on how you can go about acquiring this Skill Module. The guide below will therefore go over how you can get and use Bunny’s Bionic Fuel Module in The First Descendant.
How to farm for Bunny’s Bionic Fuel Module in The First Descendant

The only way to obtain the Bionic Fuel Skill Module is to get it as a drop from the Frost Walker. You will need to face the Colossi under the Void Intercept Mission (Hard) menu and then beat it to have a chance of obtaining the module.
The drop rate for it is extremely low, and you might need to keep clearing the mission over and over again to finally get it.
The mission has a pretty high-level recommendation, so it’s not something that you should be looking to clear in the early-to-mid game.
The Frost Walker is weak to Fire, so you will have a much easier time taking it down with Descendants like Lepic and Esiemo.
Best uses of Bunny’s Bionic Fuel Skill Module
When slotted the Bionic Fuel will decrease the speed of Bunny’s Speed of Light and will consume HP instead of MP. This makes it the perfect mod to slot in with others like the Overwhelming Shield and HP Collector.
Overwhelming Shield will increase Bunny’sMax Shield by 50% of Max HP, however, the Max HP in return will be fixed to 1. So now when you pair it with the Bionic Fuel Module, Bunny will have 100% uptime on her Speed of Light as HP will never go down.

Now this in conjunction with Light Emmision will allow her to clear content in The First Descendant incredibly quickly.
Alternatively, the HP Collector Module will let you siphon health from enemies when you defeat them. So if you can enhance it and get its cooldown low enough, you will be able to keep regenerating health by clearing mobs.
This will let Bunny have infinite use of her Speed of Light as long as she is getting to kill enemies.