I dunno, this looks like a regular caveman knife to me.~Suspecting customer
The Alien Knife is good for new players and it can be used for a short time. Around the mid-game, you will struggle a bit against some creatures, but it’s still better than fighting barehanded.
Alien Knife can be found in places which has alien weapons () icon. It can also be crafted in the Workshop.
Crafting & Upgrading
To craft Alien Knife, you will need:
1x Bone Knife ()
6x Jewelry ()
2x Knitwear ()
2x Tanker scalpels ()