The hunter becomes the hunted.
The alien warrior succumbs to a more skilled creature... The guardian predator.
The alien blood / slime is just some green hair gel. I have a green slime that I bought months ago, stored it in my room, and now it's just some murky green watery liquid. Hence, I just settled for the green hair gel. It's a little light in color and translucent, but it still works as an alien slime/blood. I just smeared it on the alien figure and on the retractable blade of the predator.
The alien figure is a dismantled mcfarlane grid alien figure which I got for free from another fellow customizer.
The predator figure started out as a classic open mouth predator, repainted the whole body and head, changed his body armor, and re-sculpted all the armor pieces. He was also given a removable re-breather mask so he can swap it to the regular bare open mouth.
A lot of work went into this predator figure, he has tons of accessories too. I'll post him on an individual custom entry soon but right now, here he is... Standing tall and proud showing his recent kill which he effortlessly tore in half. A dead, slimy, and bloody alien creature.