The Iak-thrakal were an odd lot, thinkable only in a purely orcish society such as Gundabad, for they were largely the orc equivalent of a secret agency. They represented the Ashdurbuk's personal network of agents, spies and informants among the Orcs and consisted largely of Ilguz members.
The commoners of Gundabad knew them as the Spiders, and they themselves had adapted a "spider in a web" as their organisations Seal.