The Christmas tree whip! It's a magical - mk, nevermind. A quick gameplay and information video on the Scoliac, an Infested whip released in update 11.5 along with the Oberon Warframe.
Music: (uhh, can't remember the artist, I'll update when I wake up) - Falcon Punch
Creditzorz to the wikia for the stats: http://warframe.wikia.com/wiki/WARFRAME_Wiki
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The Scoliac is an infested whip added in Update 11.5. This weapon deals primarily Slash damage.