Hi, Vince,
Yeah, the idea of totally destroying the world for 'fun', does seem a little bit stange, to say the least.
But, you have to remember that the Unlife is a totally alien 'force', it's debatable whether it is actually 'sentient' in the way that we understand sentience. It's also debatable that it's servants actually know and understand what it is really trying to do- how exactly is an ape-descended lifeform like us, going to communicate with a force from another Universe? Our brains evolved to allow us to be better at finding nuts- and our language was developed to communicate danger and other simple concepts (like where the best nuts are....)
As for the Ordainers, they could well simply be in it to kill, maim and mutilate- and be worshipped by humans with similar aspirations, perhaps. (How do 'God's' come into existence?)
It's doubtful that even the Ordainers 'know' what the Unlife's ultimate goal actually is. Or, it's possible that an Ordainer is what you get, when a Demon of Might is totally, and irrevocably, corrupted by the Unlife- in which case it wouldn't care either way- because it's 'soul' has been totally subsumed by the Unlife and does it's thinking for it- the body is just a shell, or vessel, for the Unlife...
I've generally thought of the Unlife as being Entropy- in the sense that it's actual goal is to homogenise the whole Universe. To make the Universe the same throughout- a limitless 'sea' of atoms spread evenly (and
very thinly) throughout the whole of Creation.
Conversely, the Essaence is trying to make it (the whole of creation) ordered and structured. Taking this to it's ultimate conclusion- and being a little gloomy- it might well be that the Essaence's ultimate goal is to make entirety of creation into one giant, ordered and structured whole- which knowing gravity as we do, we'd call a Hyper-Massive Singularity.....
And, in both cases you get the same result-
changelessness.
Hmmmm, makes me wonder if working for the Priests Arnak is such a bad thing after all!?!?!
Actually, that's quite a scary idea- that the Essaence and Unlife are just different 'directions' on the so-called 'Entropy Arrow'....
As to your comment about destroying the world, that might not actually be the Unlife's idea- it's goal might just be to stop itself being utilized- which means that it has to destroy
all life to achieve this (there's nothing more chaotic than life, itself!)
Hope this helps.
All the Best,
Kevin.