Although you cannot permalag them, I have been able to limit commands where a spellcaster/communer may only get one spell/prayer out in four to six rounds of combat with almost any lagging warrior skill. If you put in failure, especially as a battlerager, mages would be utterly useless against you.

Pelgor coning you once every 6 rounds while eating 6 full rounds of mostly unparried combat including deathblows. Even with 1000 hit points that wears does quickly. You do damage not only through your directed attacks but also just from round combat. An invoker/communer who is not doing directed attacks is not causing any kind of melee damage, and thus is losing, fast.