Drinking worm blood doesn't seem to harm me, drench me or anything else except the screen starts pulsing. Is there some hidden effect to the worm blood?
2 Answers
According to the wiki article on worms,
Worms bleed worm blood, which when drank grants temporary night vision that is necessary to see in the Dark Cave, as well as a colour shifting screen effect.
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1I also heard rumors about it increasing kick strength. Commented Oct 11, 2019 at 7:31
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It's not very clear from the other answer what Worm Blood is actually doing.
When you have the worm blood effect it makes a glowing circle around you which fades to black near the edges of the screen. Within this viewing radius, you can see through walls, similar to the All Seeing Eye Perk, but not as "clean" (it's blurrier, pulses, and is harder to actually see things). Consider it to be the poor-man's All Seeing Eye.
I personally love worm blood! Every time I kill worms I use a Chainsaw to grind them up into massive pools of worm blood, then go to work guzzling it all down. I often end up with 10+ minutes of seeing through walls!
It's great for locating chests and other secrets, seeing enemies in areas you haven't uncovered yet, or going into the dark caves to the west of the Mines for the Heart powerups found there. If you have the Extra Blood Perk it amplifies the amount of blood from worms which maximises the silliness even more!