Loz said:
Chaos in Elric, however, is something entirely different (though with a great many similarities) and works very differently.
Chaos in Elric is Creation/Entropy and is opposed by Law which is Sterilirty/Order. Either taken to extremes are not good for "normal life". The ideal state is the Cosmic Balance, where both forces cancel each other out allowing for a peaceful and fruitful existance.
Chaos in Glorantha is a sort of Cosmic Cancer. It is destructive rather than creative. (Chaotic "fertility" dieties might include Ragnaglar - driven insane by lust, Thed - Goddess of Rape, or Bagog, the Scorpion Queen who feeds on others in order that they may be reborn in her image). Dieties like Porchamgo the Mutator, or the Gorpgod are really just changing non-chaotic creatures or matter in to chaos in their own image rather than genuinely creating.
In Moorcock's Multiverse, Law and Chaos are philosophical positions (as well as being religions) - groups, nations or species may tend towards one or the other, but other than social pressure, there is little to stop a Melnibonean worshipping a God of Law. And while people will be more comfortable with others who share their views, worshippers of Law and Chaos can be friends or allies (providing they aren't to extreme) - just as in our world Protestants, Catholics, Jews and Muslims can all be friends, even if, in some places and/or times their beliefs are violently opposed.
In Glorantha Chaos is more like HP Lovecrafts cthulhu mythos. Some creatures are doomed to chaos by the actions of their ancestors (The wild healer of the Rockwood Mountains is supposedly a Broo who is free of the taint of chaos, but there are few, if any others). Those who choose to join a Chaos cult seeking power are like Cthulhu Cultists - If they weren't mad when they made the decision, they are almost certainly less than sane as time goes on, as the Cult feeds both their ego and their paranoia and sociopathic tendancies.