The best replacement for pentakill is undertaker yorick.

The best alternatives to pentakill are rated as following:
★★★★★  undertaker yorick
★★★★  grim reaper karthus
★★★★  lord mordekaiser
★★★  brolaf
★  pentakill

Your alternative for pentakill is not listed? Suggest!
Speaking about pentakill, one probably shouldn't forget about karthus.

Other search terms related to pentakill and their ratings are:
★★★★★ karthus
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Google Trends

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pentakill
undertaker yorick
grim reaper karthus