Ruse was the human Warren known as the Path of the Sea. It was controlled by the Elder God Mael. It was described by Quick Ben as the hardest Warren to master; there was not a High Mage of Ruse in the Malazan Empire, nor had there been any among the Moranth for at least 7,000 years.
On the night that Adjunct Tavore Paran brought the Malaz 14th Army to Malaz City, Quick Ben noted the city was laden with pockets of mobile High Ruse traps. They were made of "water, stolen from deep oceans and retaining that savage pressure—they crush everything they envelop" and deliver agonising death. These traps were likely the work of Mallick Rel.