The phrase "arcane procedures" refers to complex and mysterious methods or systems that are difficult for most people to understand or follow. Full definition
Net neutrality not dead yet as Democratic senator attempts long - shot arcane procedure to save it (9to5mac.com)
Too often, however, the field is looked upon as a set of arcane procedures that are implemented, without much thought, by computer algorithms. (science.sciencemag.org)
«For example, the minister has removed the need for the MIB's detailed and arcane procedures by the simple expedient of making it obligatory to join the MIB as a party in any action. (newlawjournal.co.uk)