Stylised blood or poison or goo is such a cool element to add to you designs and it really helps to give a sense of story. Check out these two ways of modelling blood that make it pretty much fool-proof.
Designing a Sword with NO Booleans:
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Hard Ops and Boxcutter discount bundle:
Hard Ops:
Boxcutter:
Just Panels Add On:
Construction Lines:
Cablerator:
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Machin3 Tools: