Warcueid

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Arcueid when she's rampaging around in a frenzy.
You can catch a glimpse of this in the Ciel Route, though it seems she still had enough composure to recognize Shiki.

Tsukihime Data Collection: Tsukihime Dictionary
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This is Arcueid gone mad. Also called Evil Arcueid. In Melty Blood, when TATARI transforms and materializes as Arcueid, this is the name used to refer to him. You can also catch a glimpse of Red Arcueid in Tsukihime's Ciel route.

MB Official Strategy Guide: Melty Blood Glossary
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Arcueid after going into a wild frenzy and becoming totally indiscriminate with her rage. “Evil” Arcueid.
You can catch a glimpse of this in the Ciel Route, though it seems she still had enough composure to recognize Shiki.
The Tatari Arcueid in Melty Blood is technically more akin to Arcueid in this state than to the Crimson Moon. Her attacks have become more monstrous due to her personality, and she revels in cruelty. She's known for the way she shouts “Rip and tear, rip and tear!” as she pulls her enemies apart limb from limb with her own two hands. The root is the selfish princess Arcueid's former royal manner of speech.

Tsukihime Dokuhon Plus Period: Tsukihime Dictionary Revised
Translator's Notes
  1. ^ Literally “Berserk Arcueid.”