Spell belonging to Tipid's Liquid Dervish class, which he rates above any mercenary's pulse rifle.
When Donut complains that the enemy's Hired Mercenary reinforcements were allowed to bring weapons while the returning crawlers were not, Tipid shrugs it off. The mercs get a few rudimentary spells and whatever gear they already owned, but they could not choose a race or a class — and Tipid would take his Murder Tornado spell over a pulse rifle any day.
The spell comes with the Liquid Dervish class he selected under The Standard Merc Package, replacing the poisoner class he ran during his original crawl. He grins as he names it, and the implication is not subtle: a level 60 tenner with the right class is worth considerably more than his numbers suggest.
Signature offensive spell of Tipid's Liquid Dervish class.