The Phalanx Tiger is a creature in the Caves of the Void. It always hunts in groups. Anathem Mire named it as such from the Greek 'Phalanx' which was a formation of lots of troops and the Tiger always hunted in groups. They are responsible for the deaths of more than one member of Mire's expedition.
They are described as having grey and black fur that was short and fine. It grew up around the protrusions of bones at its joints and around it skull. They also had multiple rows of teeth.