Thorc the Terrible
Description
Thorc is a Boss in Chaos 2 difficulty that has a chance to appear on wave 5. He is a bigger cybork who carries a large hammer he uses to slam into the ground sending out an emp shockwave that disables Auras, Traps, and Nodes for a longer time than the normal Cyborcs. He can also disable defenses that are too close behind him.
Strategy
You can use the same strategy as used to deal with Cyborcs, you will want to use Towers and Blockades since they will not be disabled. Cannons, Ramsters and Poison Dart Towers are particularly effective. A Tenacity Servo mod can shorten or immunize Defenses against this disable.