The IKS Devisor was the Klingon battle cruiser commanded by Captain Koloth in 2269, armed with an experimental stasis weapon that could immobilise a starship but drained the Klingon vessel's own power.
The Devisor appears in the animated episode More Tribbles, More Troubles. The Enterprise, escorting two robot ships full of grain to Sherman's Planet, finds the Klingon cruiser chasing a small scout ship and rescues its pilot, who turns out to be Cyrano Jones.
Koloth uses a new weapon that holds the Enterprise in a stasis field and leaves it unable to move or fire, though the Devisor can sustain it only briefly. He demands Jones, who has stolen a glommer, a predator bred by the Klingons to hunt tribbles.
Kirk ends the stand-off by beaming a load of Jones's tribbles, which no longer breed but grow enormous, on to the Klingon ship.