An event, situation, etc. that is characterised by gore.(noun)
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Use "gorefest" in a sentence
"Looks like an American version of Shaun of the Dead, and a gorefest which isn't particularly attractive."
"Mortal Kombat on the other hand, is going to have a ridiculous and far more convoluted task of reclaiming it's throne because it was made off those tiny nuanced & subjective factors (i.e. the gorefest that the fanchise is known for)."
"Now that I've grown up, I've found that I favor the ideas in SF style games over the gorefest of MK (which always struck me as rather uninspired), but I am unable to input the sequences necessary for the really impressive moves."