Building a Time Machine 2: Vegetable Oil

We need Vegetable Oil to build the Time Machine! Don't ask me why, because I don't know...

You can get Vegetable Oil by hunting plant monsters.

Hunt monsters around your level. Monsters that are too easy for you won't drop any oil.

And don't get caught up eliminating monsters! Aliens are our real enemy right now!

What? Why not?

You got the Vegetable Oil. Good Job!

Seriously, though. What do you think this Vegetable Oil is used for?

You didn't bring the Vegetable Oil yet!